确保多个进程同时写入同一个文件成功(php)

 

function writeData($filepath, $data)
{
    $fp = fopen($filepath,'a');
    do{
        usleep(100);
    }while (!flock($fp, LOCK_EX));

    $res = fwrite($fp, $data."\n");
    flock($fp, LOCK_UN);
    fclose($fp);
    return $res;
}