PHP Example Method for Checking If a Port Can Be Bound

This article example shows how PHP checks whether a port can be bound. Share it for your reference, as follows:

<?php
/**
 *  Check whether the port can be bound 
 * @author flynetcn
 */
function checkPortBindable($host, $port, &$errno=null, &$errstr=null)
{
  $socket = stream_socket_server("tcp://$host:$port", $errno, $errstr);
  if (!$socket) {
    return false;
  }
  fclose($socket);
  unset($socket);
  return true;
}
 
$ret = checkPortBindable('127.0.0.1', 8080, $errno, $errstr);
var_dump($ret, $errno, $errstr);

Run results:

bool(true)
int(0)
string(0) ""

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I hope this article is helpful to everyone's PHP programming.