PHP多重判断删除文件函数代码

/**
* func: delete_file
* params: $file 文件名称
* 多重条件判断 删除文件
* by bbs.it-home.org
*/
function delete_file($file)
{
    if (file_exists($file))
    {
        $delete = chmod ($file, 0777);
        $delete = unlink($file);
        if(file_exists($file))
        {
            $filesys = eregi_replace("/","\\",$file);
            $delete = system("del $filesys");
            clearstatcache();
            if(file_exists($file))
            {
                $delete = chmod ($file, 0777);
                $delete = unlink($file);
                $delete = system("del $filesys");
            }
        }
        clearstatcache();
        if(file_exists($file))
        {
            return 'Delete Faile  : '.$file.'';
        }
        else
        {
            return 'Delete Successs : '.$file.'';
        }
    }
    else
    {
        return 'Delete Successs : '.$file.'';
    }
}
?>