PHP CFS加密

<?php
/**
 * CFS Encode 
 * @example echo CFS::Encode("213123123");
 * @author Tianku
 * @link http://sms.8eoo.com/cfs/exapmle.php
 */
class CFS
{
    
    public static function Encode($Str){
        @ini_set('precision', 15); //没有权限的服务器无效,加密结果与常见的有些差异
        $Lens = 30;
        $Space = $Lens - strlen($Str);
        if(!$Space<1){
            for($cecr=0;$cecr<$Space;$cecr++){
                $Str = $Str.chr(21);
            }
        }
        $NewCode = 1;
        for($cecb=0;$cecb<$Lens;$cecb++){
            $Been = $Lens + ord(substr($Str, $cecb, 1)) * (1+$cecb);
            $NewCode = $NewCode * $Been;
        }
        $Str = $NewCode;
        $NewCode = '';
        for($cec=0;$cec<strlen($Str);$cec++){
            $NewCode = $NewCode.CFS::CfsCode(substr($Str, $cec,3));
        }
        for($cec=20;$cec<=strlen($NewCode)-18;$cec=$cec+2){
            $ret_Str = $ret_Str.substr($NewCode, $cec-1, 1);
        }
        return $ret_Str;
    }

    static function  CfsCode($word){
        for($cc=0;$cc<strlen($word);$cc++){
            $code = $code.ord(substr($word, $cc, 1));
        }
        $code = dechex($code);
        $code = strtoupper($code);
        return $code;
    }
}