php如何实时监听目录有新文件变化？

第一种不需要安装东西直接通过while循环对比目录下文件夹的md5值是否有变动，代码如下：

<?php

 
class FileWatch
{
 
    protected $all = array();
 
    public function __construct($dir)
    {
      
        $this->watch($dir);
    }
 
    //子类中重写这个方法
    public function run($file)
    {
    }
 
    protected function all_file($dir)
    {
        if (is_file($dir)) {
            $this->all[$dir] = md5_file($dir);
            return $this->all;
        }
        if (is_dir($dir)) {
            $open = opendir($dir);
            while (($file = readdir($open)) !== false) {
                if ($file != "." && $file != "..") {
                    $f = $dir . "/" . $file;
                    if (is_file($f)) {
                        $this->all[$f] = md5_file($f);
                    } elseif (is_dir($f)) {
                        $this->all_file($f);
                    }
 
                }
            }
        }
        return $this->all;
    }
 
    public function watch($dir)
    {
        $this->all = array();
        $old = $this->all_file($dir);
        while (true) {
            sleep(2);
          
            $this->all = array();
            $new = $this->all_file($dir);
            $re = array_diff($new, $old);
            $del = array_diff_key($old, $new);
            $re = array_merge($re, $del);
            if ($re) {
                $this->all = array();
                $old = $this->all_file($dir);
                $file = array_keys($re);
                $this->run($file[0]);
            }
        }
    }
}//endclass
//使用方法
class mywatch extends FileWatch
{
  
    public function run($file)
    {
        
     
        if(!empty($file)) {
            echo "new file or file has been changed with ".$file.PHP_EOL;
           
 
          
        } else {
            echo "no files has created and no files has been c...

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