Source of wpml-absolute-url-persisted.php - main

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     * @return string|false|null If the URL has already been processed but could not be resolved, it will return `false`
 
<?php
​
class WPML_Absolute_Url_Persisted {
​
    const OPTION_KEY = 'wpml_resolved_url_persist';
​
    private static $instance;
​
    /**
     * @var array
     */
    private $urls;
​
    /**
     * @return WPML_Absolute_Url_Persisted
     */
    public static function get_instance() {
        if ( null === self::$instance ) {
            self::$instance = new self();
        }
​
        return self::$instance;
    }
​
    protected function __construct() {}
​
    private function __clone() {}
​
    /**
     * @throws Exception
     */
    public function __wakeup() {
        throw new Exception( 'Cannot unserialize singleton' );
    }
​
    /**
     * Returns urls array.
     *
     * @return array Array with urls.
     */
    private function get_urls() {
        if ( null === $this->urls ) {
            $this->urls = get_option( self::OPTION_KEY, array() );
​
            if ( ! is_array( $this->urls ) ) {
                $this->urls = array();
            }
        }
​
        return $this->urls;
    }
​
    /** @return bool */
    public function has_urls() {
        return (bool) $this->get_urls();
    }
​
    /**
     * @param string       $original_url
     * @param string       $lang
     * @param string|false $converted_url A `false` value means that the URL could not be resolved
     */
    public function set( $original_url, $lang, $converted_url ) {