/Core/Model/Network/socket.php

<?php

namespace Core\Model\Network;

/**

* This class will act as either a listener socket, a client socket or a server socket.

* EXAMPLE 1: Make a listener:

*   $listenSocket = new socket($MyExternalIP, $MyOpenPort);

*   $listenSocket->open();

* 

* EXAMPLE 2: Client / server Socket:

*   $serverSock = new Socket();

*   $serverSock->Accept($listenSock->getSock());

* 

* @author Philip Brookes 

* email: phil@locals.ie 

* twitter: @philthi

* 

* I love talking to people

* if you wish to comment on any of the code below

* do not hesitate to contact me.

* 

*/

class socket {

	private $ip;

	private $port;

	private $sockHandle;



	public function getSock(){

		return $this->sockHandle;

	}

	public function setIP($newVal){

		$this->ip = $newVal;

	}

	public function getIP(){

		return $this->ip;

	}



	public function setPort($newVal){

		$this->port = $newVal;

	}

	public function getPort(){return $this->port;}



	/**

	* IP and Port are required if this socket will be a listener socket

	*/

	public function __construct($ip=null, $port=null){

		$this->sockHandle = socket_create(AF_INET, SOCK_STREAM, 0);

		//Make it a non-blocking socket

		socket_set_nonblock($this->sockHandle);

		$this->setPort($port);

		$this->setIP($ip);

	}                                                                                            



	public function open($ip=null, $port=null){                                                                                                                                                  

		if($ip)         $this->setIP($ip);                                                                                                                                                   

		if($port)       $this->setPort($port);                                                                                                                                               

		//Binds to specified socket and port and listens for connection requests

		if(socket_bind($this->sockHandle, $this->getIP(), $this->getPort())){                                                                                                                

			socket_listen($this->sockHandle);

			return true;

		}

		return false;

	}

	//accepts the pending connection request from a socketHandle (Note that this is not an instance of this class, but the return of getSock())

	public function accept($socket=null){

		if(is_null($socket)) return false;

		$newconn = @socket_accept($socket);

		if($newconn == false) return false;

		else $this->sockHandle = $newconn;

		//Make it a non-blocking connection

		socket_set_nonblock($this->sockHandle);

		return true;

	}



	//reads data from the socket, will return blank if nothing is there to read

	public function getData(){

		$data = @socket_read($this->sockHandle, 1024);

		return $data;

	}

	

	//Returns true if the remote end is still connected, false if the remote end has hung up.

	public function isAlive(){

	    $res = @socket_recv($this->sockHandle, $data, 1024, MSG_PEEK);

	    $result = socket_last_error($this->sockHandle);

	    //if bytes received is zero rather than blank, client has hung up

	    if($result == 32 || $result == 104 || $res === 0){

			return false;

	    }else{

			return true;

	    }

	}

	//send data to the remote socket

	public function write($data){

		socket_write($this->sockHandle, $data);

	}

	//disconnect the socket

	public function close(){

		socket_close($this->sockHandle);

	}

}