瞥socket 好多东西不明白

		function __construct ($address, $port) {<br />			error_reporting (E_ALL);<br />			set_time_limit (0);<br />			ob_implicit_flush ();<br />			<br />			// Socket creation<br />			$this->master = socket_create (AF_INET, SOCK_STREAM, SOL_TCP) or die("socket_create() failed");<br />			socket_set_option ($this->master, SOL_SOCKET, SO_REUSEADDR, 1) or die("socket_option() failed");<br />			socket_bind ($this->master, $address, $port) or die("socket_bind() failed");<br />			socket_listen ($this->master, 20) or die("socket_listen() failed");<br />			$this->sockets[] = $this->master;<br />			$this->say ("Server Started : " . date ('Y-m-d H:i:s'));<br />			$this->say ("Listening on   : {$address} {$port}");<br />			$this->say ("Master socket  : {$this->master}\n");<br /><br />			// Main loop<br />			while (true) {<br /><br />				$changed = $this->sockets;<br />				socket_select ($changed, $write = NULL, $except = NULL, NULL);<br /><br />				foreach ($changed as $socket) {<br />					if ($socket == $this->master) {<br /><br /><br />						$client = socket_accept ($this->master);<br /><br />						if ($client < 0) {<br />							$this->log ("socket_accept() failed");<br />							continue;<br />						}<br />						else {<br />							// Connects the socket<br />							$this->connect ($client);<br />						}<br />					}<br />					else {<br /><br />						$bytes = @socket_recv ($socket, $buffer, 2048, 0);<br />						if ($bytes == 0) {<br />							// On socket.close ();<br />							$this->disconnect ($socket);<br />						}<br />						else {<br />							// Retrieve the user from his socket<br />							$user = $this->getuserbysocket ($socket);<br />							<br />							if (!$user->handshake) {<br />								$this->dohandshake ($user, $buffer);<br />							}<br />							else {<br />								$this->process ($user, $this->decode ($buffer));<br />							}<br />						}<br />					}<br />				}<br />			}<br />		}