MySQL Cache Class

<?php
/*
Title: MySQL Cache
Created by: Radoslav Mazganov
Email: raadoo at abv dot bg
Portfolio: http://soul-design.org/

How To Use
$cache->ClearCache('7c1141fbce2eb2407964b25b59b43ed4');
$cache->ClearCache();
$cache->Query("SELECT * FROM `table`");
$cache->Query("SELECT * FROM `table`", true);
*/

class MySQLCache{

	public $dir = 'cache';
	public $ext = 'txt';
	
	function QueryCached($key){
		return file_exists($this->dir.'/'.$key.'.'.$this->ext);
	}
	
	function ReturnQuery($key){
		$file = $this->dir.'/'.$key.'.'.$this->ext;
		$handle = fopen($file, "r");
		$contents = fread($handle, filesize($file));
		fclose($handle);
		return unserialize(trim($contents));
	}
	
	function CacheQuery($query, $key, $result = false){
		$results = mysql_query($query);
		while ($row = mysql_fetch_array($results)) $all_rows[] = $row;
		$temp = $all_rows;
		$all_rows = serialize($all_rows);	
		$fp = fopen($this->dir.'/'.$key.'.'.$this->ext, 'w');
		fwrite($fp, $all_rows);
		fclose($fp);
		if($result) return $temp;
	}
	
	function ClearCache($key = false){
		if(strlen($key) == '32'){
			if(self::QueryCached($key)) unlink($this->dir.'/'.$key.'.'.$this->ext);
		} else {
			$all_files = scandir($this->dir.'/');
			foreach($all_files as $file){
				if(end(explode('.', $file)) == $this->ext) unlink($this->dir.'/'.$file);
			}
		}
	}
	
	function Query($query, $result = false){
		$key = md5($query);
		if($result){
			if(self::QueryCached($key)){
				$this->result = self::ReturnQuery($key);
			} else $this->result = self::CacheQuery($query, $key, true);
		} else {
			if(!self::QueryCached($key)) self::CacheQuery($query, $key);
		}
	}
}
?>

SELECT SQL_CACHE query

SELECT table1.*, COUNT(table2.id) AS cnt FROM table1 INNER JOIN table2 ON table1. id = table2 . post_id LIMIT 12

SELECT SQL_CACHE table1.*, COUNT(table2.id) AS cnt FROM table1 INNER JOIN table2 ON table1. id = table2 . post_id LIMIT 12