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<?php if ( ! defined( 'ABSPATH' ) ) exit; if ( ! class_exists( 'Icegram_Cache' ) ) { /* // Example usage $cache = new Icegram_Cache('category', 14 * 86400); $val = $cache->get( $key ); if ( $val === null ) { // Not in cache, compute $val = doyourprocess(); $cache->set( $key, $val ); } // Now use the $val function cleanup() { $cache = new Icegram_Cache('category', 14 * 86400); $cache->cleanup(); } // For cleanup wp_schedule_event( time(), 'daily', array($this, 'cleanup') ); */ class Icegram_Cache { var $base_dir; var $expire_after; var $enabled; var $_group; var $_hashes; public function set( $key, $data ) { if (!$this->enabled) return false; $res = file_put_contents($this->_file( $key ), serialize($data)); return ( $res === false ) ? false : true; } public function get( $key ) { if (!$this->enabled) return null; if ($this->_exists( $key )) { return unserialize( file_get_contents( $this->_file( $key ))); } return null; } public function delete( $key ) { if (!$this->enabled) return true; if ($this->_exists( $key )) { return unlink( $this->_file( $key ) ); } return true; } public function cleanup( ) { if (!$this->enabled) return true; foreach (glob($this->base_dir . $this->_group . "*") as $filename) { if (filemtime($filename) < time() - $this->expire_after) { @unlink($filename); } } return true; } private function _exists( $key ) { return (is_file( $this->_file( $key ) ) ); } private function _file( $key ) { return $this->base_dir . $this->_group . '_' . $this->_hash( $key ); } private function _hash( $key ) { if (!array_key_exists($key, $this->_hashes)) { $this->_hashes[ $key ] = md5($key); } return $this->_hashes[ $key ]; } public function __construct( $group = '', $expire_after = 86400, $base_dir = '' ) { $this->_group = sanitize_key($group); $this->base_dir = $base_dir; $this->expire_after = $expire_after; $this->_hashes = array(); if (empty($this->base_dir)) { $uploads = wp_upload_dir(); $uploads_base_dir = trailingslashit( $uploads['basedir'] ); $this->base_dir = $uploads_base_dir . 'igcache/'; } if (!is_dir( $this->base_dir )) { if ( false === mkdir( $this->base_dir ) ) { $this->enabled = false; return; } } $this->base_dir = trailingslashit( $this->base_dir ); $this->enabled = true; } } }