Check hlds status and calculate latency.

hldsStatus.php

<?php

/**
 * hldsStatus class file.
 *
 * Check hlds status and calculate latency.
 * 
 * @author  Alexandru G.
 * @link    http://www.gentle.ro/
 * @version 0.1.1
 * @license http://www.gnu.org/licenses/lgpl-3.0.txt GNU Public License
 */
class hldsStatus
{
    /**
     * Server IP
     * @var string
     */
    protected $ip;
    
    /**
     * Server port
     * @var int
     */
    protected $port;
    
    /**
     * Server latency
     * @var int
     */
    protected $latency;
    
    /**
     * Socket holder
     * @var ??
     */
    protected $sock;
    
    /**
     * Check if specified server is online
     * 
     * @access  public
     * @param   string  $address    Server address
     * @param   int     $timeout    Socket timeout (optional)
     * @return  string
     */
    public function status($address, $timeout = 6)
    {
        $this->_parseAddr($address);
        
        if ($this->sock = @fsockopen('udp://'.$this->ip, $this->port, $errno, $errstr, $timeout))
        {
            $startTime = microtime(true);
            
            stream_set_timeout($this->sock, $timeout);
            fwrite($this->sock, "\xFF\xFF\xFF\xFFTSource Engine Query".chr(0));
            $status = (!fread($this->sock, 5)) ? 'Offline' : 'Online';
            fclose($this->sock);
            
            $stopTime  = microtime(true);
            $this->latency = number_format( ($stopTime - $startTime) * 1000, 3 );
        }
        else
        {
            $status = 'Offline';
        }
        
        return $status;   
    }
    
    /**
     * Get the server latency
     * 
     * @access  public
     * @param   string  $address    Server address (optional)
     * @return  int                 -1 on error
     */
    public function ping($address = null)
    {
        if (!is_numeric($this->port))
        {
            if (is_null($address))
            {
                throw new Exception('Specify the server address');
            }
            
            $this->status($address);
        }
        
        return (is_numeric($this->latency)) ? $this->latency : '-1';
    }
    
    /**
     * Extract IP and Port from given address
     * 
     * @access  private
     * @param   string  $address
     * @return  void
     */
    private function _parseAddr($address)
    {
        if (filter_var($address, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE))
        {
            $this->ip   = $address;
            $this->port = 27015;
        }
        else
        {
            $pcs        = explode(':', $address);
            $this->ip   = gethostbyname($pcs[0]);
            $this->port = (isset($pcs[1])) ? $pcs[1] : 27015;
        }
    }
        
    /**
     * Clean before exit
     */
    public function __destruct()
    {
        if (!is_null($this->sock))
        {
            $this->sock = $this->ip = $this->port = null;
        }
    }
}

/**
 * Example
 */
$server = new hldsStatus();
echo $server->status('216.52.148.71:27015').' - '.$server->ping().'<br>';
echo $server->status('212.200.163.180:27027').' - '.$server->ping().'<br>';
echo $server->status('cs.extream.ro').' - '.$server->ping().'<br>';

?>