<?php

    class Cache{

        var $path;
        var $file;
        var $expireTime;
        var $modifiedTime;
        var $extension = ".cache";

        function Cache( $path , $expireTime = 120 ){
            clearstatcache();
            $this->setPath( $path );
            $this->setExpireTime( $expireTime );
            $this->setFile( $_SERVER['PHP_SELF'] );
            $this->setModifiedTime( $this->path . $this->file . $this->extension );

        }
        function setExtenstion( $extension ){
            $this->extension = ( string ) $extension;
        }
        function getExtension(){
            return $this->extension;
        }
        function setPath( $path ){

            // creates the cache directory if not exist
            if ( is_dir( $path ) === FALSE ){
                mkdir( $path , 0777 );
            }

            // validates the cache path 
            $length = ( INT ) strlen( $path ) - 1 ;
            if ( $path[$length] != "/" ) {
                $path .= "/";
            }

            $this->path = $path   ;
        }
        function getPath(){
            return $this->path;
        }
        function setFile( $file ) {
            $path =  pathinfo( $file );
            $file = $path['basename'];
            $this->file = ( STRING ) $file;
        }
        function getFile(){
            return $this->file;
        }
        function setExpireTime( $time ) {
            $this->expireTime = $time ;
        }
        function getExpireTime(){
            return $this->expireTime;
        }
        function setModifiedTime( $file ){
            if ( file_exists( $file )  ) {
                $this->modifiedTime = ( time() -  filemtime( $file ) ) ;
            }else{
                $this->modifiedTime = 0;
            }
        }
        function getModifiedTime(){
            return $this->modifiedTime;
        }
        function read(){
            //readfile ( $this->path . $this->file . $this->extension );
            print file_get_contents  ( $this->path . $this->file . $this->extension );
            exit();
        }
        function save(){
            $contents = ob_get_contents();

            $file =   $this->path . $this->file . $this->extension;
            $handle = fopen( $file , "w" );
            fputs( $handle , $contents );
            fclose( $handle );
            /*
            ob_end_clean();
            print $contents;
            */
        }
        function isCached(){

            global $HTTP_GET_VARS;

            $ret = TRUE;
            if (
                    $this->modifiedTime > $this->expireTime  ||
                    !file_exists( $this->path . $this->file . $this->extension ) ||
                    isset( $_GET['update'] )

                ) {

                ob_start();
                $ret = FALSE;

            }

            return $ret;
        }



    }

?>