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<?php

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/**

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* Core class that implements an file cache.

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* @since 3.27.3

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* The Object Cache stores all of the cache data to file and makes the cache

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* contents available by using a file name as key, which is used to name and later retrieve

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* the cache contents.

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* @package ET\Core\Cache_File

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class ET_Core_Cache_File {

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/**

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* Cached data holder.

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* @since 3.27.3

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* @var array

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protected static $_cache = array();

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/**

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* Loaded cache file data.

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* @since 3.27.3

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* @var array

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protected static $_cache_loaded = array();

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/**

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* Cached data status.

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* @since 3.27.3

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* @var array

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protected static $_dirty = array();

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/**

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* Sets the data contents into the cache.

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* @since 3.27.3

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* @param string $cache_name What is the file name that storing the cache data.

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* @param mixed $data The cache data to be set.

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* @return void

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public static function set( $cache_name, $data ) {

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if ( self::is_disabled() ) {

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return;

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}

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self::$_cache[ $cache_name ] = $data;

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self::$_dirty[ $cache_name ] = $cache_name;

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}

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/**

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* Retrieves the cache contents, if it exists.

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* @since 3.27.3

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* @param string $cache_name What is the file name that storing the cache data.

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* @return mixed

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public static function get( $cache_name ) {

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if ( self::is_disabled() ) {

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return array();

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}

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if ( ! isset( self::$_cache_loaded[ $cache_name ] ) ) {

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$file = self::get_cache_file_name( $cache_name );

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if ( et_()->WPFS()->is_readable( $file ) ) {

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self::$_cache[ $cache_name ] = unserialize( et_()->WPFS()->get_contents( $file ) );

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} else {

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self::$_cache[ $cache_name ] = array();

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}

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self::$_cache_loaded[ $cache_name ] = true;

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}

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return isset( self::$_cache[ $cache_name ] ) ? self::$_cache[ $cache_name ] : array();

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}

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/**

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* Saves Cache.

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* @since 3.27.3

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* @return void

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public static function save_cache() {

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if ( self::is_disabled() || ! self::$_dirty || ! self::$_cache ) {

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return;

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}

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foreach ( self::$_dirty as $cache_name ) {

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if ( ! isset( self::$_cache[ $cache_name ] ) ) {

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continue;

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}

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$data = self::$_cache[ $cache_name ];

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$file = self::get_cache_file_name( $cache_name );

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if ( ! wp_is_writable( dirname( $file ) ) ) {

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continue;

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}

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et_()->WPFS()->put_contents( $file, serialize( $data ) );

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}

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}

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/**

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* Get full path of cache file name.

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* The file name will be suffixed with .data

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* @since 3.27.3

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* @param string $cache_name What is the file name that storing the cache data.

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* @return string

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public static function get_cache_file_name( $cache_name ) {

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return sprintf( '%1$s/%2$s.data', ET_Core_PageResource::get_cache_directory(), $cache_name );

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}

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/**

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* Check is file based caching is disabled.

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* @since 4.0.8

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* @return bool

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public static function is_disabled() {

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return defined( 'ET_DISABLE_FILE_BASED_CACHE' ) && ET_DISABLE_FILE_BASED_CACHE;

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}

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}

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// Hook the shutdown action once.

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if ( ! has_action( 'shutdown', 'ET_Core_Cache_File::save_cache' ) ) {

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add_action( 'shutdown', 'ET_Core_Cache_File::save_cache' );

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}

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