php 文件锁

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2018/1/6
 * Time: 11:30
 */

class FileLock{

    //文件锁存放路径
    private $path='';

    //文件句柄
    private $fp='';

    //锁文件
    private $lockFile='';

    /**
     * 构造函数
     * @param string $path 锁的存放目录
     * @param string $name 锁 KEY
     */
    public function __construct($name,$path=''){
        if(empty($path)) $this->path=RUNTIME_PATH;
        else $this->path=$path;
        $this->lockFile=$this->path.md5($name).'.lock';
    }

    /**
     * 加锁
     */
    public function lock(){
        $this->fp=fopen($this->lockFile,'a+');
        if($this->fp===false){
            return false;
        }
        return flock($this->fp,LOCK_EX);//获取独占锁
    }

    /**
     * 解锁
     */
    public function unlock(){
        if($this->fp!==false){
            @flock($this->fp,LOCK_UN);
            clearstatcache();
        }
        @fclose($this->fp);
        @unlink($this->lockFile);
    }
}