php高级--实现多个进程同时写一个文件成功

 //核心思想,加锁
    public function writeFile(){
        $fq = fopen("test.html","w+");
        if(flock($fq,LOCK_EX)){
            //获得写锁,写数据
            fwrite($fq,"write something");
            //接触锁定
            flock($fq,LOCK_UN);
        }else{
            echo 'file is locking';
        }
    }