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Current File : /var/www/html/wp-content/plugins/shortcodes-ultimate/freemius/includes/fs-core-functions.php
<?php
    /**
     * @package     Freemius
     * @copyright   Copyright (c) 2015, Freemius, Inc.
     * @license     https://www.gnu.org/licenses/gpl-3.0.html GNU General Public License Version 3
     * @since       1.0.3
     */

    if ( ! defined( 'ABSPATH' ) ) {
        exit;
    }

    if ( ! function_exists( 'fs_dummy' ) ) {
        function fs_dummy() {
        }
    }

    /* Url.
    --------------------------------------------------------------------------------------------*/
    if ( ! function_exists( 'fs_get_url_daily_cache_killer' ) ) {
        function fs_get_url_daily_cache_killer() {
            return date( '\YY\Mm\Dd' );
        }
    }

    /* Templates / Views.
    --------------------------------------------------------------------------------------------*/
    if ( ! function_exists( 'fs_get_template_path' ) ) {
        function fs_get_template_path( $path ) {
            return WP_FS__DIR_TEMPLATES . '/' . trim( $path, '/' );
        }

        function fs_include_template( $path, &$params = null ) {
            $VARS = &$params;
            include fs_get_template_path( $path );
        }

        function fs_include_once_template( $path, &$params = null ) {
            $VARS = &$params;
            include_once fs_get_template_path( $path );
        }

        function fs_require_template( $path, &$params = null ) {
            $VARS = &$params;
            require fs_get_template_path( $path );
        }

        function fs_require_once_template( $path, &$params = null ) {
            $VARS = &$params;
            require_once fs_get_template_path( $path );
        }

        function fs_get_template( $path, &$params = null ) {
            ob_start();

            $VARS = &$params;
            require fs_get_template_path( $path );

            return ob_get_clean();
        }
    }

    /* Scripts and styles including.
    --------------------------------------------------------------------------------------------*/

    if ( ! function_exists( 'fs_asset_url' ) ) {
        /**
         * Generates an absolute URL to the given path. This function ensures that the URL will be correct whether the asset
         * is inside a plugin's folder or a theme's folder.
         *
         * Examples:
         * 1. "themes" folder
         *    Path: C:/xampp/htdocs/fswp/wp-content/themes/twentytwelve/freemius/assets/css/admin/common.css
         *    URL: http://fswp:8080/wp-content/themes/twentytwelve/freemius/assets/css/admin/common.css
         *
         * 2. "plugins" folder
         *    Path: C:/xampp/htdocs/fswp/wp-content/plugins/rating-widget-premium/freemius/assets/css/admin/common.css
         *    URL: http://fswp:8080/wp-content/plugins/rating-widget-premium/freemius/assets/css/admin/common.css
         *
         * @author Leo Fajardo (@leorw)
         * @since  1.2.2
         *
         * @param  string $asset_abs_path Asset's absolute path.
         *
         * @return string Asset's URL.
         */
        function fs_asset_url( $asset_abs_path ) {
            $wp_content_dir = fs_normalize_path( WP_CONTENT_DIR );
            $asset_abs_path = fs_normalize_path( $asset_abs_path );

            if ( 0 === strpos( $asset_abs_path, $wp_content_dir ) ) {
                // Handle both theme and plugin assets located in the standard directories.
                $asset_rel_path = str_replace( $wp_content_dir, '', $asset_abs_path );
                $asset_url      = content_url( fs_normalize_path( $asset_rel_path ) );
            } else {
                $wp_plugins_dir = fs_normalize_path( WP_PLUGIN_DIR );
                if ( 0 === strpos( $asset_abs_path, $wp_plugins_dir ) ) {
                    // Try to handle plugin assets that may be located in a non-standard plugins directory.
                    $asset_rel_path = str_replace( $wp_plugins_dir, '', $asset_abs_path );
                    $asset_url      = plugins_url( fs_normalize_path( $asset_rel_path ) );
                } else {
                    // Try to handle theme assets that may be located in a non-standard themes directory.
                    $active_theme_stylesheet = get_stylesheet();
                    $wp_themes_dir           = fs_normalize_path( trailingslashit( get_theme_root( $active_theme_stylesheet ) ) );
                    $asset_rel_path          = str_replace( $wp_themes_dir, '', fs_normalize_path( $asset_abs_path ) );
                    $asset_url               = trailingslashit( get_theme_root_uri( $active_theme_stylesheet ) ) . fs_normalize_path( $asset_rel_path );
                }
            }

            return $asset_url;
        }
    }

    if ( ! function_exists( 'fs_enqueue_local_style' ) ) {
        function fs_enqueue_local_style( $handle, $path, $deps = array(), $ver = false, $media = 'all' ) {
            wp_enqueue_style( $handle, fs_asset_url( WP_FS__DIR_CSS . '/' . trim( $path, '/' ) ), $deps, $ver, $media );
        }
    }

    if ( ! function_exists( 'fs_enqueue_local_script' ) ) {
        function fs_enqueue_local_script( $handle, $path, $deps = array(), $ver = false, $in_footer = 'all' ) {
            wp_enqueue_script( $handle, fs_asset_url( WP_FS__DIR_JS . '/' . trim( $path, '/' ) ), $deps, $ver, $in_footer );
        }
    }

    if ( ! function_exists( 'fs_img_url' ) ) {
        function fs_img_url( $path, $img_dir = WP_FS__DIR_IMG ) {
            return ( fs_asset_url( $img_dir . '/' . trim( $path, '/' ) ) );
        }
    }

    #--------------------------------------------------------------------------------
    #region Request handlers.
    #--------------------------------------------------------------------------------

    if ( ! function_exists( 'fs_request_get_raw' ) ) {
        /**
         * A helper function to fetch GET/POST user input with an optional default value when the input is not set.
         * This function does not do sanitization. It is up to the caller to properly sanitize and validate the input.
         *
         * The return of this function is always unslashed.
         *
         * @since 2.5.10
         *
         * @param string      $key
         * @param mixed       $def
         * @param string|bool $type When set to 'get', it will look for the value passed via query string. When
         *                          set to 'post', it will look for the value passed via the POST request's body. Otherwise,
         *                          it will check if the parameter was passed using any of the mentioned two methods.
         *
         * @return mixed
         */
        function fs_request_get_raw( $key, $def = false, $type = false ) {
            if ( is_string( $type ) ) {
                $type = strtolower( $type );
            }

            /**
             * Note to WordPress.org reviewers:
             * This is a helper function to fetch GET/POST user input with an optional default value when the input is not set. The actual sanitization is done in the scope of the function's usage.
             */
            switch ( $type ) {
                case 'post':
                    // phpcs:ignore WordPress.Security.NonceVerification.Missing
                    $value = isset( $_POST[ $key ] ) ? $_POST[ $key ] : $def;
                    break;
                case 'get':
                    // phpcs:ignore WordPress.Security.NonceVerification.Recommended
                    $value = isset( $_GET[ $key ] ) ? $_GET[ $key ] : $def;
                    break;
                default:
                    // phpcs:ignore WordPress.Security.NonceVerification.Recommended
                    $value = isset( $_REQUEST[ $key ] ) ? $_REQUEST[ $key ] : $def;
                    break;
            }

            // Don't unslash if the value itself is empty (empty string, null, empty array etc).
            return empty( $value ) ? $value : wp_unslash( $value );
        }
    }

    if ( ! function_exists( 'fs_sanitize_input' ) ) {
        /**
         * Sanitizes input recursively (if an array).
         *
         * @param mixed $input
         *
         * @return mixed
         * @uses  sanitize_text_field()
         * @since 2.5.10
         */
        function fs_sanitize_input( $input ) {
            if ( is_array( $input ) ) {
                foreach ( $input as $key => $value ) {
                    $input[ $key ] = fs_sanitize_input( $value );
                }
            } else {
                // Allow empty values to pass through as-is, like `null`, `''`, `0`, `'0'` etc.
                $input = empty( $input ) ? $input : sanitize_text_field( $input );
            }

            return $input;
        }
    }

    if ( ! function_exists( 'fs_request_get' ) ) {
        /**
         * A helper method to fetch GET/POST user input with an optional default value when the input is not set.
         *
         * @author Vova Feldman (@svovaf)
         *
         * @note The return value is always sanitized with sanitize_text_field().
         *
         * @param string      $key
         * @param mixed       $def
         * @param string|bool $type Since 1.2.1.7 - when set to 'get' will look for the value passed via querystring, when
         *                          set to 'post' will look for the value passed via the POST request's body, otherwise,
         *                          will check if the parameter was passed in any of the two.
         *
         *
         * @return mixed
         */
        function fs_request_get( $key, $def = false, $type = false ) {
            return fs_sanitize_input( fs_request_get_raw( $key, $def, $type ) );
        }
    }

    if ( ! function_exists( 'fs_request_has' ) ) {
        function fs_request_has( $key ) {
            // phpcs:ignore WordPress.Security.NonceVerification.Recommended
            return isset( $_REQUEST[ $key ] );
        }
    }

    if ( ! function_exists( 'fs_request_get_bool' ) ) {
        /**
         * A helper method to fetch GET/POST user boolean input with an optional default value when the input is not set.
         *
         * @author Vova Feldman (@svovaf)
         *
         * @param string $key
         * @param bool $def
         *
         * @return bool|mixed
         */
        function fs_request_get_bool( $key, $def = false ) {
            $val = fs_request_get( $key, null );

            if ( is_null( $val ) ) {
                return $def;
            }

            if ( is_bool( $val ) ) {
                return $val;
            } else if ( is_numeric( $val ) ) {
                if ( 1 == $val ) {
                    return true;
                } else if ( 0 == $val ) {
                    return false;
                }
            } else if ( is_string( $val ) ) {
                $val = strtolower( $val );

                if ( 'true' === $val ) {
                    return true;
                } else if ( 'false' === $val ) {
                    return false;
                }
            }

            return $def;
        }
    }

    if ( ! function_exists( 'fs_request_is_post' ) ) {
        function fs_request_is_post() {
            return ( 'post' === strtolower( $_SERVER['REQUEST_METHOD'] ) );
        }
    }

    if ( ! function_exists( 'fs_request_is_get' ) ) {
        function fs_request_is_get() {
            return ( 'get' === strtolower( $_SERVER['REQUEST_METHOD'] ) );
        }
    }

    if ( ! function_exists( 'fs_get_action' ) ) {
        function fs_get_action( $action_key = 'action' ) {
            // phpcs:disable WordPress.Security.NonceVerification.Recommended
            if ( ! empty( $_REQUEST[ $action_key ] ) && is_string( $_REQUEST[ $action_key ] ) ) {
                return strtolower( $_REQUEST[ $action_key ] );
            }

            if ( 'action' == $action_key ) {
                $action_key = 'fs_action';

                if ( ! empty( $_REQUEST[ $action_key ] ) && is_string( $_REQUEST[ $action_key ] ) ) {
                    return strtolower( $_REQUEST[ $action_key ] );
                }
            }

            return false;
            // phpcs:enable WordPress.Security.NonceVerification.Recommended
        }
    }

    if ( ! function_exists( 'fs_request_is_action' ) ) {
        function fs_request_is_action( $action, $action_key = 'action' ) {
            return ( strtolower( $action ) === fs_get_action( $action_key ) );
        }
    }

    if ( ! function_exists( 'fs_request_is_action_secure' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.0.0
         *
         * @since  1.2.1.5 Allow nonce verification.
         *
         * @param string $action
         * @param string $action_key
         * @param string $nonce_key
         *
         * @return bool
         */
        function fs_request_is_action_secure(
            $action,
            $action_key = 'action',
            $nonce_key = 'nonce'
        ) {
            if ( strtolower( $action ) !== fs_get_action( $action_key ) ) {
                return false;
            }

            $nonce = ! empty( $_REQUEST[ $nonce_key ] ) ?
                $_REQUEST[ $nonce_key ] :
                '';

            if ( empty( $nonce ) ||
                 ( false === wp_verify_nonce( $nonce, $action ) )
            ) {
                return false;
            }

            return true;
        }
    }

    #endregion

    if ( ! function_exists( 'fs_is_plugin_page' ) ) {
        function fs_is_plugin_page( $page_slug ) {
            return ( is_admin() && $page_slug === fs_request_get( 'page' ) );
        }
    }

    if ( ! function_exists( 'fs_get_raw_referer' ) ) {
        /**
         * Retrieves unvalidated referer from '_wp_http_referer' or HTTP referer.
         *
         * Do not use for redirects, use {@see wp_get_referer()} instead.
         *
         * @since 1.2.3
         *
         * @return string|false Referer URL on success, false on failure.
         */
        function fs_get_raw_referer() {
            if ( function_exists( 'wp_get_raw_referer' ) ) {
                return wp_get_raw_referer();
            }
            if ( ! empty( $_REQUEST['_wp_http_referer'] ) ) {
                return wp_unslash( $_REQUEST['_wp_http_referer'] );
            } else if ( ! empty( $_SERVER['HTTP_REFERER'] ) ) {
                return wp_unslash( $_SERVER['HTTP_REFERER'] );
            }

            return false;
        }
    }

    /* Core UI.
    --------------------------------------------------------------------------------------------*/
    if ( ! function_exists( 'fs_ui_action_button' ) ) {
        /**
         * @param number      $module_id
         * @param string      $page
         * @param string      $action
         * @param string      $title
         * @param string      $button_class
         * @param array       $params
         * @param bool        $is_primary
         * @param bool        $is_small
         * @param string|bool $icon_class   Optional class for an icon (since 1.1.7).
         * @param string|bool $confirmation Optional confirmation message before submit (since 1.1.7).
         * @param string      $method       Since 1.1.7
         *
         * @uses fs_ui_get_action_button()
         */
        function fs_ui_action_button(
            $module_id,
            $page,
            $action,
            $title,
            $button_class = '',
            $params = array(),
            $is_primary = true,
            $is_small = false,
            $icon_class = false,
            $confirmation = false,
            $method = 'GET'
        ) {
            echo fs_ui_get_action_button(
                $module_id,
                $page,
                $action,
                $title,
                $button_class,
                $params,
                $is_primary,
                $is_small,
                $icon_class,
                $confirmation,
                $method
            );
        }
    }

    if ( ! function_exists( 'fs_ui_get_action_button' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.1.7
         *
         * @param number      $module_id
         * @param string      $page
         * @param string      $action
         * @param string      $title
         * @param string      $button_class
         * @param array       $params
         * @param bool        $is_primary
         * @param bool        $is_small
         * @param string|bool $icon_class   Optional class for an icon.
         * @param string|bool $confirmation Optional confirmation message before submit.
         * @param string      $method
         *
         * @return string
         */
        function fs_ui_get_action_button(
            $module_id,
            $page,
            $action,
            $title,
            $button_class = '',
            $params = array(),
            $is_primary = true,
            $is_small = false,
            $icon_class = false,
            $confirmation = false,
            $method = 'GET'
        ) {
            // Prepend icon (if set).
            $title = ( is_string( $icon_class ) ? '<i class="' . $icon_class . '"></i> ' : '' ) . $title;

            if ( is_string( $confirmation ) ) {
                return sprintf( '<form action="%s" method="%s"><input type="hidden" name="fs_action" value="%s">%s<a href="#" class="%s" onclick="if (confirm(\'%s\')) this.parentNode.submit(); return false;">%s</a></form>',
                    freemius( $module_id )->_get_admin_page_url( $page, $params ),
                    $method,
                    $action,
                    wp_nonce_field( $action, '_wpnonce', true, false ),
                    'button' . ( ! empty( $button_class ) ? ' ' . $button_class : '' ) . ( $is_primary ? ' button-primary' : '' ) . ( $is_small ? ' button-small' : '' ),
                    $confirmation,
                    $title
                );
            } else if ( 'GET' !== strtoupper( $method ) ) {
                return sprintf( '<form action="%s" method="%s"><input type="hidden" name="fs_action" value="%s">%s<a href="#" class="%s" onclick="this.parentNode.submit(); return false;">%s</a></form>',
                    freemius( $module_id )->_get_admin_page_url( $page, $params ),
                    $method,
                    $action,
                    wp_nonce_field( $action, '_wpnonce', true, false ),
                    'button' . ( ! empty( $button_class ) ? ' ' . $button_class : '' ) . ( $is_primary ? ' button-primary' : '' ) . ( $is_small ? ' button-small' : '' ),
                    $title
                );
            } else {
                return sprintf( '<a href="%s" class="%s">%s</a></form>',
                    wp_nonce_url( freemius( $module_id )->_get_admin_page_url( $page, array_merge( $params, array( 'fs_action' => $action ) ) ), $action ),
                    'button' . ( ! empty( $button_class ) ? ' ' . $button_class : '' ) . ( $is_primary ? ' button-primary' : '' ) . ( $is_small ? ' button-small' : '' ),
                    $title
                );
            }
        }

        function fs_ui_action_link( $module_id, $page, $action, $title, $params = array() ) {
            ?><a class=""
                 href="<?php echo wp_nonce_url( freemius( $module_id )->_get_admin_page_url( $page, array_merge( $params, array( 'fs_action' => $action ) ) ), $action ) ?>"><?php echo $title ?></a><?php
        }
    }

    if ( ! function_exists( 'fs_get_entity' ) ) {
        /**
         * @author Leo Fajardo (@leorw)
         * @since 2.3.1
         *
         * @param mixed  $entity
         * @param string $class
         *
         * @return FS_Plugin|FS_User|FS_Site|FS_Plugin_License|FS_Plugin_Plan|FS_Plugin_Tag|FS_Subscription
         */
        function fs_get_entity( $entity, $class ) {
            if ( ! is_object( $entity ) || $entity instanceof $class ) {
                return $entity;
            }

            return new $class( $entity );
        }
    }

    if ( ! function_exists( 'fs_get_entities' ) ) {
        /**
         * @author Leo Fajardo (@leorw)
         * @since 2.3.1
         *
         * @param mixed  $entities
         * @param string $class_name
         *
         * @return FS_Plugin[]|FS_User[]|FS_Site[]|FS_Plugin_License[]|FS_Plugin_Plan[]|FS_Plugin_Tag[]|FS_Subscription[]
         */
        function fs_get_entities( $entities, $class_name ) {
            if ( ! is_array( $entities ) || empty( $entities ) ) {
                return $entities;
            }

            // Get first element.
            $first_array_element = reset( $entities );

            if ( $first_array_element instanceof $class_name ) {
                /**
                 * If the first element of the array is an instance of the context class, assume that all other
                 * elements are instances of the class.
                 */
                return $entities;
            }

            if (
                is_array( $first_array_element ) &&
                ! empty( $first_array_element )
            ) {
                $first_array_element = reset( $first_array_element );

                if ( $first_array_element instanceof $class_name ) {
                    /**
                     * If the first element of the `$entities` array is an array whose first element is an instance of the
                     * context class, assume that all other objects are instances of the class.
                     */
                    return $entities;
                }
            }

            foreach ( $entities as $key => $entities_or_entity ) {
                if ( is_array( $entities_or_entity ) ) {
                    $entities[ $key ] = fs_get_entities( $entities_or_entity, $class_name );
                } else {
                    $entities[ $key ] = fs_get_entity( $entities_or_entity, $class_name );
                }
            }

            return $entities;
        }
    }

    if ( ! function_exists( 'fs_nonce_url' ) ) {
        /**
         * Retrieve URL with nonce added to URL query.
         *
         * Originally was using `wp_nonce_url()` but the new version
         * changed the return value to escaped URL, that's not the expected
         * behaviour.
         *
         * @author Vova Feldman (@svovaf)
         * @since  ~1.1.3
         *
         * @param string     $actionurl URL to add nonce action.
         * @param int|string $action    Optional. Nonce action name. Default -1.
         * @param string     $name      Optional. Nonce name. Default '_wpnonce'.
         *
         * @return string Escaped URL with nonce action added.
         */
        function fs_nonce_url( $actionurl, $action = - 1, $name = '_wpnonce' ) {
            return add_query_arg( $name, wp_create_nonce( $action ), $actionurl );
        }
    }

    if ( ! function_exists( 'fs_parse_url_params' ) ) {
        /**
         * Returns the query parameters of the given URL if there are any.
         *
         * @param string $url
         * @param bool   $html_entity_decode
         *
         * @return array<string, string> Key value pair where key represents the parameter name and value represents the parameter value.
         */
        function fs_parse_url_params( $url, $html_entity_decode = false ) {
            $query_str  = parse_url( $url, PHP_URL_QUERY );
            $url_params = array();

            if ( empty( $query_str ) ) {
                return $url_params;
            }

            if ( $html_entity_decode ) {
                $query_str = html_entity_decode( $query_str );
            }

            parse_str( $query_str, $url_params );

            return $url_params;
        }
    }

    if ( ! function_exists( 'fs_starts_with' ) ) {
        /**
         * Check if string starts with.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.1.3
         *
         * @param string $haystack
         * @param string $needle
         *
         * @return bool
         */
        function fs_starts_with( $haystack, $needle ) {
            $length = strlen( $needle );

            return ( substr( $haystack, 0, $length ) === $needle );
        }
    }

    if ( ! function_exists( 'fs_ends_with' ) ) {
        /**
         * Check if string ends with.
         *
         * @author Vova Feldman (@svovaf)
         * @since  2.0.0
         *
         * @param string $haystack
         * @param string $needle
         *
         * @return bool
         */
        function fs_ends_with( $haystack, $needle ) {
            $length = strlen( $needle );
            $start  = $length * - 1; // negative

            return ( substr( $haystack, $start ) === $needle );
        }
    }

    if ( ! function_exists( 'fs_strip_url_protocol' ) ) {
        function fs_strip_url_protocol( $url ) {
            if ( ! fs_starts_with( $url, 'http' ) ) {
                return $url;
            }

            $protocol_pos = strpos( $url, '://' );

            if ( $protocol_pos > 5 ) {
                return $url;
            }

            return substr( $url, $protocol_pos + 3 );
        }
    }

    #region Url Canonization ------------------------------------------------------------------

    if ( ! function_exists( 'fs_canonize_url' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.1.3
         *
         * @param string $url
         * @param bool   $omit_host
         * @param array  $ignore_params
         *
         * @return string
         */
        function fs_canonize_url( $url, $omit_host = false, $ignore_params = array() ) {
            $parsed_url = parse_url( strtolower( $url ) );

//		if ( ! isset( $parsed_url['host'] ) ) {
//			return $url;
//		}

            $canonical = ( ( $omit_host || ! isset( $parsed_url['host'] ) ) ? '' : $parsed_url['host'] ) . $parsed_url['path'];

            if ( isset( $parsed_url['query'] ) ) {
                parse_str( $parsed_url['query'], $queryString );
                $canonical .= '?' . fs_canonize_query_string( $queryString, $ignore_params );
            }

            return $canonical;
        }
    }

    if ( ! function_exists( 'fs_canonize_query_string' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.1.3
         *
         * @param array $params
         * @param array $ignore_params
         * @param bool  $params_prefix
         *
         * @return string
         */
        function fs_canonize_query_string( array $params, array &$ignore_params, $params_prefix = false ) {
            if ( ! is_array( $params ) || 0 === count( $params ) ) {
                return '';
            }

            // Url encode both keys and values
            $keys   = fs_urlencode_rfc3986( array_keys( $params ) );
            $values = fs_urlencode_rfc3986( array_values( $params ) );
            $params = array_combine( $keys, $values );

            // Parameters are sorted by name, using lexicographical byte value ordering.
            // Ref: Spec: 9.1.1 (1)
            uksort( $params, 'strcmp' );

            $pairs = array();
            foreach ( $params as $parameter => $value ) {
                $lower_param = strtolower( $parameter );

                // Skip ignore params.
                if ( in_array( $lower_param, $ignore_params ) ||
                     ( false !== $params_prefix && fs_starts_with( $lower_param, $params_prefix ) )
                ) {
                    continue;
                }

                if ( is_array( $value ) ) {
                    // If two or more parameters share the same name, they are sorted by their value
                    // Ref: Spec: 9.1.1 (1)
                    natsort( $value );
                    foreach ( $value as $duplicate_value ) {
                        $pairs[] = $lower_param . '=' . $duplicate_value;
                    }
                } else {
                    $pairs[] = $lower_param . '=' . $value;
                }
            }

            if ( 0 === count( $pairs ) ) {
                return '';
            }

            return implode( "&", $pairs );
        }
    }

    if ( ! function_exists( 'fs_urlencode_rfc3986' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.1.3
         *
         * @param string|string[] $input
         *
         * @return array|mixed|string
         */
        function fs_urlencode_rfc3986( $input ) {
            if ( is_array( $input ) ) {
                return array_map( 'fs_urlencode_rfc3986', $input );
            } else if ( is_scalar( $input ) ) {
                return str_replace( '+', ' ', str_replace( '%7E', '~', rawurlencode( $input ) ) );
            }

            return '';
        }
    }

    #endregion Url Canonization ------------------------------------------------------------------

    if ( ! function_exists( 'fs_download_image' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         *
         * @since  1.2.2 Changed to usage of WP_Filesystem_Direct.
         *
         * @param string $from URL
         * @param string $to   File path.
         *
         * @return bool Is successfully downloaded.
         */
        function fs_download_image( $from, $to ) {
            $dir = dirname( $to );

            if ( 'direct' !== get_filesystem_method( array(), $dir ) ) {
                return false;
            }

            if ( ! class_exists( 'WP_Filesystem_Direct' ) ) {
                require_once ABSPATH . 'wp-admin/includes/class-wp-filesystem-base.php';
                require_once ABSPATH . 'wp-admin/includes/class-wp-filesystem-direct.php';
            }

            $fs      = new WP_Filesystem_Direct( '' );
            $tmpfile = download_url( $from );

            if ( $tmpfile instanceof WP_Error ) {
                // Issue downloading the file.
                return false;
            }

            $fs->copy( $tmpfile, $to );
            $fs->delete( $tmpfile );

            return true;
        }
    }

    /* General Utilities
    --------------------------------------------------------------------------------------------*/

    if ( ! function_exists( 'fs_sort_by_priority' ) ) {
        /**
         * Sorts an array by the value of the priority key.
         *
         * @author Daniel Iser (@danieliser)
         * @since  1.1.7
         *
         * @param $a
         * @param $b
         *
         * @return int
         */
        function fs_sort_by_priority( $a, $b ) {

            // If b has a priority and a does not, b wins.
            if ( ! isset( $a['priority'] ) && isset( $b['priority'] ) ) {
                return 1;
            } // If b has a priority and a does not, b wins.
            elseif ( isset( $a['priority'] ) && ! isset( $b['priority'] ) ) {
                return - 1;
            } // If neither has a priority or both priorities are equal it's a tie.
            elseif ( ( ! isset( $a['priority'] ) && ! isset( $b['priority'] ) ) || $a['priority'] === $b['priority'] ) {
                return 0;
            }

            // If both have priority return the winner.
            return ( $a['priority'] < $b['priority'] ) ? - 1 : 1;
        }
    }

    #--------------------------------------------------------------------------------
    #region Localization
    #--------------------------------------------------------------------------------

    global $fs_text_overrides;

    if ( ! isset( $fs_text_overrides ) ) {
        $fs_text_overrides = array();
    }

    if ( ! function_exists( 'fs_text' ) ) {
        /**
         * Retrieve a translated text by key.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.2.1.7
         *
         * @param string $key
         * @param string $slug
         *
         * @return string
         *
         * @global       $fs_text_overrides
         */
        function fs_text( $key, $slug = 'freemius' ) {
            global $fs_text_overrides;

            if ( isset( $fs_text_overrides[ $slug ] ) ) {
                if ( isset( $fs_text_overrides[ $slug ][ $key ] ) ) {
                    return $fs_text_overrides[ $slug ][ $key ];
                }

                $lower_key = strtolower( $key );
                if ( isset( $fs_text_overrides[ $slug ][ $lower_key ] ) ) {
                    return $fs_text_overrides[ $slug ][ $lower_key ];
                }
            }

            return $key;
        }

        #region Private

        /**
         * Retrieve an inline translated text by key with a context.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text    Translatable string.
         * @param string $context Context information for the translators.
         * @param string $key     String key for overrides.
         * @param string $slug    Module slug for overrides.
         *
         * @return string
         *
         * @global       $fs_text_overrides
         */
        function _fs_text_x_inline( $text, $context, $key = '', $slug = 'freemius' ) {
            list( $text, $text_domain ) = fs_text_and_domain( $text, $key, $slug );

            // Avoid misleading Theme Check warning.
            $fn = 'translate_with_gettext_context';

            return $fn( $text, $context, $text_domain );
        }

        #endregion

        /**
         * Retrieve an inline translated text by key with a context.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text    Translatable string.
         * @param string $context Context information for the translators.
         * @param string $key     String key for overrides.
         * @param string $slug    Module slug for overrides.
         *
         * @return string
         *
         * @global       $fs_text_overrides
         */
        function fs_text_x_inline( $text, $context, $key = '', $slug = 'freemius' ) {
            return _fs_text_x_inline( $text, $context, $key, $slug );
        }

        /**
         * Output a translated text by key.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.2.1.7
         *
         * @param string $key
         * @param string $slug
         */
        function fs_echo( $key, $slug = 'freemius' ) {
            echo fs_text( $key, $slug );
        }

        /**
         * Output an inline translated text.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text Translatable string.
         * @param string $key  String key for overrides.
         * @param string $slug Module slug for overrides.
         */
        function fs_echo_inline( $text, $key = '', $slug = 'freemius' ) {
            echo _fs_text_inline( $text, $key, $slug );
        }

        /**
         * Output an inline translated text with a context.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text    Translatable string.
         * @param string $context Context information for the translators.
         * @param string $key     String key for overrides.
         * @param string $slug    Module slug for overrides.
         */
        function fs_echo_x_inline( $text, $context, $key = '', $slug = 'freemius' ) {
            echo _fs_text_x_inline( $text, $context, $key, $slug );
        }
    }

    if ( ! function_exists( 'fs_text_override' ) ) {
        /**
         * Get a translatable text override if exists, or `false`.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.2.1.7
         *
         * @param string $text Translatable string.
         * @param string $key  String key for overrides.
         * @param string $slug Module slug for overrides.
         *
         * @return string|false
         */
        function fs_text_override( $text, $key, $slug ) {
            global $fs_text_overrides;

            /**
             * Check if string is overridden.
             */
            if ( ! isset( $fs_text_overrides[ $slug ] ) ) {
                return false;
            }

            if ( empty( $key ) ) {
                $key = strtolower( str_replace( ' ', '-', $text ) );
            }

            if ( isset( $fs_text_overrides[ $slug ][ $key ] ) ) {
                return $fs_text_overrides[ $slug ][ $key ];
            }

            $lower_key = strtolower( $key );
            if ( isset( $fs_text_overrides[ $slug ][ $lower_key ] ) ) {
                return $fs_text_overrides[ $slug ][ $lower_key ];
            }

            return false;
        }
    }

    if ( ! function_exists( 'fs_text_and_domain' ) ) {
        /**
         * Get a translatable text and its text domain.
         *
         * When the text is overridden by the module, returns the overridden text and the text domain of the module. Otherwise, returns the original text and 'freemius' as the text domain.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.2.1.7
         *
         * @param string $text Translatable string.
         * @param string $key  String key for overrides.
         * @param string $slug Module slug for overrides.
         *
         * @return string[]
         */
        function fs_text_and_domain( $text, $key, $slug ) {
            $override = fs_text_override( $text, $key, $slug );

            if ( false === $override ) {
                // No override, use FS text domain.
                $text_domain = 'freemius';
            } else {
                // Found an override.
                $text = $override;
                // Use the module's text domain.
                $text_domain = $slug;
            }

            return array( $text, $text_domain );
        }
    }

    if ( ! function_exists( '_fs_text_inline' ) ) {
        /**
         * Retrieve an inline translated text by key.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text Translatable string.
         * @param string $key  String key for overrides.
         * @param string $slug Module slug for overrides.
         *
         * @return string
         *
         * @global       $fs_text_overrides
         */
        function _fs_text_inline( $text, $key = '', $slug = 'freemius' ) {
            list( $text, $text_domain ) = fs_text_and_domain( $text, $key, $slug );

            // Avoid misleading Theme Check warning.
            $fn = 'translate';

            return $fn( $text, $text_domain );
        }
    }

    if ( ! function_exists( 'fs_text_inline' ) ) {
        /**
         * Retrieve an inline translated text by key.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text Translatable string.
         * @param string $key  String key for overrides.
         * @param string $slug Module slug for overrides.
         *
         * @return string
         *
         * @global       $fs_text_overrides
         */
        function fs_text_inline( $text, $key = '', $slug = 'freemius' ) {
            return _fs_text_inline( $text, $key, $slug );
        }
    }

    if ( ! function_exists( 'fs_esc_attr' ) ) {
        /**
         * @author Vova Feldman
         * @since  1.2.1.6
         *
         * @param string $key
         * @param string $slug
         *
         * @return string
         */
        function fs_esc_attr( $key, $slug ) {
            return esc_attr( fs_text( $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_attr_inline' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text Translatable string.
         * @param string $key  String key for overrides.
         * @param string $slug Module slug for overrides.
         *
         * @return string
         */
        function fs_esc_attr_inline( $text, $key = '', $slug = 'freemius' ) {
            return esc_attr( _fs_text_inline( $text, $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_attr_x_inline' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text    Translatable string.
         * @param string $context Context information for the translators.
         * @param string $key     String key for overrides.
         * @param string $slug    Module slug for overrides.
         *
         * @return string
         */
        function fs_esc_attr_x_inline( $text, $context, $key = '', $slug = 'freemius' ) {
            return esc_attr( _fs_text_x_inline( $text, $context, $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_attr_echo' ) ) {
        /**
         * @author Vova Feldman
         * @since  1.2.1.6
         *
         * @param string $key
         * @param string $slug
         */
        function fs_esc_attr_echo( $key, $slug ) {
            echo esc_attr( fs_text( $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_attr_echo_inline' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text Translatable string.
         * @param string $key  String key for overrides.
         * @param string $slug Module slug for overrides.
         */
        function fs_esc_attr_echo_inline( $text, $key = '', $slug = 'freemius' ) {
            echo esc_attr( _fs_text_inline( $text, $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_js' ) ) {
        /**
         * @author Vova Feldman
         * @since  1.2.1.6
         *
         * @param string $key
         * @param string $slug
         *
         * @return string
         */
        function fs_esc_js( $key, $slug ) {
            return esc_js( fs_text( $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_js_inline' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text Translatable string.
         * @param string $key  String key for overrides.
         * @param string $slug Module slug for overrides.
         *
         * @return string
         */
        function fs_esc_js_inline( $text, $key = '', $slug = 'freemius' ) {
            return esc_js( _fs_text_inline( $text, $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_js_x_inline' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text    Translatable string.
         * @param string $context Context information for the translators.
         * @param string $key     String key for overrides.
         * @param string $slug    Module slug for overrides.
         *
         * @return string
         */
        function fs_esc_js_x_inline( $text, $context, $key = '', $slug = 'freemius' ) {
            return esc_js( _fs_text_x_inline( $text, $context, $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_js_echo_x_inline' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text    Translatable string.
         * @param string $context Context information for the translators.
         * @param string $key     String key for overrides.
         * @param string $slug    Module slug for overrides.
         *
         * @return void
         */
        function fs_esc_js_echo_x_inline( $text, $context, $key = '', $slug = 'freemius' ) {
            echo esc_js( _fs_text_x_inline( $text, $context, $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_js_echo' ) ) {
        /**
         * @author Vova Feldman
         * @since  1.2.1.6
         *
         * @param string $key
         * @param string $slug
         */
        function fs_esc_js_echo( $key, $slug ) {
            echo esc_js( fs_text( $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_js_echo_inline' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text Translatable string.
         * @param string $key  String key for overrides.
         * @param string $slug Module slug for overrides.
         */
        function fs_esc_js_echo_inline( $text, $key = '', $slug = 'freemius' ) {
            echo esc_js( _fs_text_inline( $text, $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_json_encode_echo' ) ) {
        /**
         * @author Vova Feldman
         * @since  1.2.1.6
         *
         * @param string $key
         * @param string $slug
         */
        function fs_json_encode_echo( $key, $slug ) {
            echo json_encode( fs_text( $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_json_encode_echo_inline' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text Translatable string.
         * @param string $key  String key for overrides.
         * @param string $slug Module slug for overrides.
         */
        function fs_json_encode_echo_inline( $text, $key = '', $slug = 'freemius' ) {
            echo json_encode( _fs_text_inline( $text, $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_html' ) ) {
        /**
         * @author Vova Feldman
         * @since  1.2.1.6
         *
         * @param string $key
         * @param string $slug
         *
         * @return string
         */
        function fs_esc_html( $key, $slug ) {
            return esc_html( fs_text( $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_html_inline' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text Translatable string.
         * @param string $key  String key for overrides.
         * @param string $slug Module slug for overrides.
         *
         * @return string
         */
        function fs_esc_html_inline( $text, $key = '', $slug = 'freemius' ) {
            return esc_html( _fs_text_inline( $text, $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_html_x_inline' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text    Translatable string.
         * @param string $context Context information for the translators.
         * @param string $key     String key for overrides.
         * @param string $slug    Module slug for overrides.
         *
         * @return string
         */
        function fs_esc_html_x_inline( $text, $context, $key = '', $slug = 'freemius' ) {
            return esc_html( _fs_text_x_inline( $text, $context, $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_html_echo_x_inline' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text    Translatable string.
         * @param string $context Context information for the translators.
         * @param string $key     String key for overrides.
         * @param string $slug    Module slug for overrides.
         */
        function fs_esc_html_echo_x_inline( $text, $context, $key = '', $slug = 'freemius' ) {
            echo esc_html( _fs_text_x_inline( $text, $context, $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_html_echo' ) ) {
        /**
         * @author Vova Feldman
         * @since  1.2.1.6
         *
         * @param string $key
         * @param string $slug
         */
        function fs_esc_html_echo( $key, $slug ) {
            echo esc_html( fs_text( $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_esc_html_echo_inline' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  1.2.3
         *
         * @param string $text Translatable string.
         * @param string $key  String key for overrides.
         * @param string $slug Module slug for overrides.
         */
        function fs_esc_html_echo_inline( $text, $key = '', $slug = 'freemius' ) {
            echo esc_html( _fs_text_inline( $text, $key, $slug ) );
        }
    }

    if ( ! function_exists( 'fs_override_i18n' ) ) {
        /**
         * Override default i18n text phrases.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.1.6
         *
         * @param array[string]string $key_value
         * @param string              $slug
         *
         * @global $fs_text_overrides
         */
        function fs_override_i18n( array $key_value, $slug = 'freemius' ) {
            global $fs_text_overrides;

            if ( ! isset( $fs_text_overrides[ $slug ] ) ) {
                $fs_text_overrides[ $slug ] = array();
            }

            foreach ( $key_value as $key => $value ) {
                $fs_text_overrides[ $slug ][ $key ] = $value;
            }
        }
    }

    #endregion

    #--------------------------------------------------------------------------------
    #region Multisite Network
    #--------------------------------------------------------------------------------

    if ( ! function_exists( 'fs_is_plugin_uninstall' ) ) {
        /**
         * @author Vova Feldman (@svovaf)
         * @since  2.0.0
         */
        function fs_is_plugin_uninstall() {
            return (
                defined( 'WP_UNINSTALL_PLUGIN' ) ||
                ( 0 < did_action( 'pre_uninstall_plugin' ) )
            );
        }
    }

    if ( ! function_exists( 'fs_is_network_admin' ) ) {
        /**
         * Unlike is_network_admin(), this one will also work properly when
         * the context execution is WP AJAX handler, and during plugin
         * uninstall.
         *
         * @author Vova Feldman (@svovaf)
         * @since  2.0.0
         */
        function fs_is_network_admin() {
            return (
                WP_FS__IS_NETWORK_ADMIN ||
                ( is_multisite() && fs_is_plugin_uninstall() )
            );
        }
    }

    if ( ! function_exists( 'fs_is_blog_admin' ) ) {
        /**
         * Unlike is_blog_admin(), this one will also work properly when
         * the context execution is WP AJAX handler, and during plugin
         * uninstall.
         *
         * @author Vova Feldman (@svovaf)
         * @since  2.0.0
         */
        function fs_is_blog_admin() {
            return (
                WP_FS__IS_BLOG_ADMIN ||
                ( ! is_multisite() && fs_is_plugin_uninstall() )
            );
        }
    }

    #endregion

    if ( ! function_exists( 'fs_apply_filter' ) ) {
        /**
         * Apply filter for specific plugin.
         *
         * @author Vova Feldman (@svovaf)
         * @since  1.0.9
         *
         * @param string $module_unique_affix Module's unique affix.
         * @param string $tag                 The name of the filter hook.
         * @param mixed  $value               The value on which the filters hooked to `$tag` are applied on.
         *
         * @return mixed The filtered value after all hooked functions are applied to it.
         *
         * @uses   apply_filters()
         */
        function fs_apply_filter( $module_unique_affix, $tag, $value ) {
            $args = func_get_args();

            return call_user_func_array( 'apply_filters', array_merge(
                    array( "fs_{$tag}_{$module_unique_affix}" ),
                    array_slice( $args, 2 ) )
            );
        }
    }

    if ( ! function_exists( 'fs_get_optional_constant' ) ) {
        /**
         * Gets the value of an optional constant. If the constant is not defined, the default value will be returned.
         *
         * @author Swashata Ghosh (@swashata)
         * @since 2.5.12.5
         *
         * @param string $constant_name
         * @param mixed $default_value
         *
         * @return mixed
         */
        function fs_get_optional_constant( $constant_name, $default_value = null ) {
            return defined( $constant_name ) ? constant( $constant_name ) : $default_value;
        }
    }

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