PHP判断端口是否打开的代码

[php]代码库

<?php
    $host = 'yuncode.net'; //要ping的地址，也可以是IP
     $port = '80'; //要ping的端口
    $num  = 3;
   function microtime_float()
   {
           list($usec, $sec) = explode(" ", microtime());
           return ((float)$usec + (float)$sec);
   }
  function ping($host,$port)
  {
          $time_start = microtime_float();
          $ip = gethostbyname($host);
          $fp = @fsockopen($host,$port,&$errno,&$errstr,1);
          if(!$fp) return 'replay time out!';
          $get = "GET / HTTP/1.1\\r\\nHost:".$host."\\r\\nConnection: Close\\r\\n\\r\\n";
          @fputs($fp,$get);
          @fclose($fp);
          $time_end = microtime_float();
          $time = $time_end - $time_start;
          $time = ceil($time * 1000);
          return 'Reply from '.$ip.': time='.$time.'ms<br />';
  }
  echo 'Pinging '.$host.' ['.gethostbyname($host).'] with Port:'.$port.' of data:<br /><br />'."\\r\\n";
  for($i = 0;$i < $num;$i++)
  {        
          ping($host,$port);
          sleep(1);
          ob_flush();
          flush();
  }
  ?>
//该片段来自于http://yuncode.net