PHP判断端口是否打开的代码

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<?php
 2    $host = 'www.baidu.com'; //要ping的地址，也可以是IP
 3     $port = '80'; //要ping的端口
 4    $num  = 3;
 5   function microtime_float()
 6   {
 7           list($usec, $sec) = explode(" ", microtime());
 8           return ((float)$usec + (float)$sec);
 9   }
10  function ping($host,$port)
11  {
12          $time_start = microtime_float();
13          $ip = gethostbyname($host);
14          $fp = @fsockopen($host,$port,&$errno,&$errstr,1);
15          if(!$fp) return 'replay time out!';
16          $get = "GET / HTTP/1.1\r\nHost:".$host."\r\nConnection: Close\r\n\r\n";
17          @fputs($fp,$get);
18          @fclose($fp);
19          $time_end = microtime_float();
20          $time = $time_end - $time_start;
21          $time = ceil($time * 1000);
22          return 'Reply from '.$ip.': time='.$time.'ms
';
23  }
24  echo 'Pinging '.$host.' ['.gethostbyname($host).'] with Port:'.$port.' of data:

'."\r\n";
25  for($i = 0;$i < $num;$i++)
26  {        
27          ping($host,$port);
28          sleep(1);
29          ob_flush();
30          flush();
31  }
32  ?>