<?php 
$host = '192.168.1.1'; //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++)
{
  echo ping($host,$port);
  sleep(1);
  ob_flush();
  flush();
}
?>

------解决方案--------------------
用 php 中的 exec() 调用命令来实现  最好。

------解决方案--------------------
$ip   =   "192.168.1.1";  
exec( "ping   $ip ",   $arr);  

print_r($arr);