/**
 *
 * @param string $filename
 * @param integer $lines
 * @return array 
 */
function read_last_log($filename, $lines) {
 
    if (!file_exists($filename)) return array('log no exist!') ;
 
    $fp = fopen((string)$filename,"r");
    $result = array();
 
    while (!feof($fp)) {
 
        $result[] = fgets($fp, 1024);
 
        if (count($result) > (int)$lines) {
            $result = array_slice($result, 1);
        }
    }
    fclose($fp);
 
    return $result;
 
}