client.php

<?php

set_time_limit(0);

$address = '192.168.2.102';
$port = 9000;

$sock = socket_create(AF_INET, SOCK_STREAM, 0);
socket_bind($sock, $address, $port) or die('Could not bind to address');
socket_listen($sock);

$client = socket_accept($sock);
$input = socket_read($client, 1024);

list($resource, $headers, $code) = handle_headers($input);
if (isset($headers['Sec-WebSocket-Key1']) && isset($headers['Sec-WebSocket-Key2']))
{
	$key = get_handshake_key($headers['Sec-WebSocket-Key1'], $headers['Sec-WebSocket-Key2'], $code);
}

if ($key) $headers  = <<<EOD
HTTP/1.1 101 Web Socket Protocol Handshake
Upgrade: WebSocket
Connection: Upgrade
Sec-WebSocket-Origin: {$headers['Origin']}
Sec-WebSocket-Location: ws://{$headers['Host']}$resource

$key;
EOD;
else $headers = <<<EOD
HTTP/1.1 101 Web Socket Protocol Handshake
Upgrade: WebSocket
Connection: Upgrade
WebSocket-Origin: {$headers['Origin']}
WebSocket-Location: ws://{$headers['Host']}$resource


EOD;

var_dump($input, $headers);
socket_write($client, $headers);
socket_write($client, 'Hello world!');
socket_close($client);
socket_close($sock);

function handle_headers($request)
{
	$resource = preg_match('/GET (.*?) HTTP/', $request, $match) ? $match[1] : null;
	$code = (preg_match("/\r\n(.*?)\$/", $request, $match)) ? $match[1] : null;
	$headers = array();
	foreach(explode("\r\n", $request) as $line)
	{
		if (strpos($line, ': ') !== false)
		{
			list($key, $value) = explode(': ', $line);
			$headers[trim($key)] = trim($value);
		}
	}
	return array($resource, $headers, $code);
}

function get_handshake_key($key1, $key2, $code)
{
	$handle_key = function($key)
	{
		preg_match_all('/[0-9]/', $key, $number);
		preg_match_all('/ /', $key, $space);
		if ($number && $space)
		{
			return implode('', $number[0]) / count($space[0]);
		}
		return '';
	};
	return md5(pack('N', $handle_key($key1)) . pack('N', $handle_key($key2)) . $code, true);
}