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<?php

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class WPML_WP_Cache {

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/** @var string Key name under which array of all group keys is stored */

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const KEYS = 'WPML_WP_Cache__group_keys';

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/** @var string Group name */

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private $group;

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/**

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* WPML_WP_Cache constructor.

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* @param string $group Optional. Where the cache contents are grouped. Default empty.

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public function __construct( $group = '' ) {

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$this->group = $group;

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}

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/**

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* Retrieves the cache contents from the cache by key and group.

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* @param int|string $key The key under which the cache contents are stored.

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* @param bool $found Optional. Whether the key was found in the cache (passed by reference).

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* Disambiguates a return of false, a storable value. Default null.

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* @return bool|mixed False on failure to retrieve contents or the cache

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* contents on success

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public function get( $key, &$found = null ) {

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$value = wp_cache_get( $key, $this->group, false, $found );

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if ( is_array( $value ) && array_key_exists( 'data', $value ) ) {

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// We know that we have set something in the cache.

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$found = true;

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return $value['data'];

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} else {

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$found = false;

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return $value;

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}

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}

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/**

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* Saves the data to the cache.

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* @param int|string $key The cache key to use for retrieval later.

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* @param mixed $data The contents to store in the cache.

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* @param int $expire Optional. When to expire the cache contents, in seconds.

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* Default 0 (no expiration).

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* @return bool False on failure, true on success

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public function set( $key, $data, $expire = 0 ) {

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$keys = $this->get_keys();

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if ( ! in_array( $key, $keys, true ) ) {

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$keys[] = $key;

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wp_cache_set( self::KEYS, $keys, $this->group );

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}

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// Save $value in an array. We need to do this because W3TC and Redis have bug with saving null.

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return wp_cache_set( $key, [ 'data' => $data ], $this->group, $expire );

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}

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/**

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* Removes the cache contents matching key and group.

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public function flush_group_cache() {

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$keys = $this->get_keys();

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foreach ( $keys as $key ) {

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wp_cache_delete( $key, $this->group );

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}

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wp_cache_delete( self::KEYS, $this->group );

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}

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public function execute_and_cache( $key, $callback ) {

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list( $result, $found ) = $this->get_with_found( $key );

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if ( ! $found ) {

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$result = $callback();

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$this->set( $key, $result );

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}

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return $result;

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}

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/**

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* @param string $key

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* @return array {

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* @type mixed $result @see Return value of \wp_cache_get.

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* @type bool $found @see `$found` argument of \wp_cache_get.

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* }

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public function get_with_found( $key ) {

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$found = false;

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$result = $this->get( $key, $found );

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return [ $result, $found ];

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}

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/**

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* Get stored group keys.

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* @return array

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private function get_keys() {

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$found = false;

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$keys = wp_cache_get( self::KEYS, $this->group, false, $found );

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if ( $found && is_array( $keys ) ) {

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return $keys;

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}

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return [];

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}

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}

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