Can PHP Ping a Specific IP and Port Combination?

Can PHP Ping an IP:Port Combination?

When trying to determine the availability of a server, a common approach is to ping its IP address and a specified port. However, a script designed for pinging websites may not suffice for this purpose.

The Solution

To ping an IP:port combination in PHP, one can leverage the fsockopen() function. Here's an edited script that can accomplish this:

<code class="php">function ping($host, $port, $timeout) 
{ 
  $start = microtime(true); 
  $socket = fsockopen($host, $port, $errno, $errstr, $timeout); 
  if (!$socket) { return "down"; } 
  $end = microtime(true); 
  fclose($socket);
  return round((($end - $start) * 1000), 0)." ms"; 
}</code>

In this script, after establishing a connection using fsockopen(), the ping time is calculated using the difference between the start and end timestamps. If the connection fails, the function returns "down."

Note: As pointed out in the answer provided, this script only works for TCP connections. For other protocols, more advanced techniques may be required, involving custom packet generation and parsing.

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