cache.php

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<?php
class cache {

        protected $_ds;
        
        protected $_fld;
        
        protected $_prefix;
        
        protected $_grp;
        
        protected $id;
        
        protected $_tc;
        
        protected $_enabled;

        function __construct() {

                $this->_ds = DS;
                $this->_fld = ABS_CACHE;
                $this->_prefix = 'cache_';
                $this->_enabled = true;
        }

        protected function write($data) {

                $filename = $this->getFilename();

                if($fp = @fopen($filename, "xb")) {
                        if(flock($fp, LOCK_EX)) fwrite($fp, $data);
                        fclose($fp);
                        touch($filename, time());
                }

        }

        protected function read() {
                
                return file_get_contents($this->getFilename());

        }

        protected function getFilename() {

                return $this->_fld . $this->_ds . $this->_prefix . $this->_grp ."_". md5($this->_id);

        }

        protected function isCached() {

                $filename = $this->getFilename();
                if($this->_enabled && file_exists($filename) && time() < (filemtime($filename) + $this->_tc)) return true; 
                else @unlink($filename);
                        
                return false;

        }

}

class outputCache extends cache {

        protected $_buffer;

        function __construct(&$buffer, $enable = true) {

                parent::__construct();
                $this->_buffer = &$buffer;
                $this->_enabled = $enable;
        }

        public function start($grp, $id, $tc) {
        
                $this->_grp = $grp;
                $this->_id = $id;
                $this->_tc = $tc;

                if($this->isCached()) {
                        $this->_buffer .= $this->read();
                        return false;
                }
                
                return true;

        }

        public function stop($data) {
                
                if($this->_enabled) $this->write($data);
                $this->_buffer .= $data;

        }

}

class dataCache extends cache {

        function __construct($enable = true) {

                parent::__construct();
                
                $this->_enabled = $enable;

        }
        
        public function get($grp, $id, $tc) {
        
                $this->_grp = $grp;
                $this->_id = $id;
                $this->_tc = $tc;

                if($this->isCached()) return unserialize($this->read());
                return false;

        }
        
        public function save($data) {
                
                if($this->_enabled) $this->write(serialize($data));

        }

}

?>