php cache类代码(php数据缓存类)

/* 
//php-kcache class v_0.1 
//Author: kangzj 
//Email : kangzj@mail.bnu.edu.cn 
//Blog : http://kangzj.net.ru 
//作者不保证本程序没有bug，对于使用本程序 
//而引起的任何问题不担负任何责任。 
*/ 
class php_kcache { 
    //相对或者绝对目录，末尾不要加 ‘/‘ 
    var $cache_dir = ‘./cache‘; 
    var $cache_extension = ‘.cache.php‘; 

    function set_cache($name, $value){ 
        $pre = "< ?\n//Cache Created at: ".date(‘Y-m-d H:i:s‘)."\n"; 
        if(!is_array($value)){ 
            $value = $value; 
            $str = "\$$name = ‘$value‘;"; 
        }else{ 
            $str = "\$$name = " . $this->arrayeval($value) . ‘;‘; 
        } 
        $end = "\n?>"; 
        echo $cache = $pre . $str . $end; 
        $cache_file = $this->cache_dir . ‘/‘ . $name . $this->cache_extension; 

        if($fp = @fopen($cache_file, ‘wb‘)) { 
            fwrite($fp, $cache); 
            fclose($fp); 
            return true; 
        } else { 
            echo $cache_file; 
            exit(‘Can not write to cache files, please check cache directory ‘); 
            return false; 
        } 
    } 

    //将array变成字符串, 来自discuz! 
    function arrayeval($array, $level = 0) { 

        if(!is_array($array)) { 
            return "‘".$array."‘"; 
        } 

        $space = ‘‘; 
        for($i = 0; $i < = $level; $i++) { 
            $space .= "\t"; 
        } 
        $evaluate = "Array\n$space(\n"; 
        $comma = $space; 
        if(is_array($array)) { 
            foreach($array as $key => $val) { 
                $key = is_string($key) ? ‘\‘‘.addcslashes($key, ‘\‘\\‘).‘\‘‘ : $key; 
                $val = !is_array($val) && (!preg_match("/^\-?[1-9]\d*$/", $val) || strlen($val) > 12) ? ‘\‘‘.addcslashes($val, ‘\‘\\‘).‘\‘‘ : $val; 
                if(is_array($val)) { 
                    $evaluate .= "$comma$key => ".arrayeval($val, $level + 1); 
                } else { 
                    $evaluate .= "$comma$key => $val"; 
                } 
                $comma = ",\n$space"; 
            } 
        } 
        $evaluate .= "\n$space)"; 
        return $evaluate; 
    } 
} 

include ‘./php_kcache_class.php‘; 
$pc = new php_kcache; 
$a = array(‘a‘, ‘b‘, ‘c‘); 
$pc->set_cache(‘a‘, addslashes($a));