<?php
    /* (c) deadinat0r */
    class m2mpQuery {
        protected $sIP, $sPort;
        private $sSocket, $sPing = 0, $sOnline = false, $sInfo = array();

        protected static $instance = NULL;

        /* returns ping if connected, otherwise false */
        public function __construct($ip, $port = 27015, $timeout = 2) {
            $this->sIP = $ip;
            $this->sPort = (int)$port;
            $this->sSocket = @fsockopen('udp://'.$this->sIP, $this->sPort+1, $erNo, $erStr, $timeout);
            if($this->sSocket) {
                if($this->getPing() > 0) {
                    $this->sOnline = true;
                    socket_set_timeout($this->sSocket, $timeout);
                    return $this->getPing();
                    self::$instance = self;
                }
            }
            return false;
        }

        public function __destruct() {
            @fclose($this->sSocket);
        }

        public function isOnline() {
            return $this->sOnline;
        }

        /* gets players, use foreach for listing (see example) // returns false if no players are online*/
        public function getPlayers() {
            if(!$this->isOnline()) return false;
            if(!$this->getInfo('players')) return false;

            if(!$r = $this->sendPacket('M2MPl')) return false;

            $r = str_replace($this->getInfo('players').'@', '', $r); // not the best solution, but works

            $i = explode('|', $r);
            $return = array();
            if(sizeof($i) > 0) {
                $maxPlayers = $this->getInfo('maxplayers');
                for($x = 0; $x < $maxPlayers; $x++) {
                    if(@$i[$x]) {
                        $ex = explode('/', $i[$x]);
                        $return[] = array('id' => $ex[0], 'name' => $ex[1], 'ping' => $ex[2]);
                    }
                }
            }

            return $return;
        }

        /* idea by Lordkire (http://www.m2-multiplayer.com/topic/367-php-server-query-class/) */
        public function isPlayerOnline($name) {
            if(!$players = $this->getPlayers()) return false;

            foreach($players as $p) {
                if($p['name'] === $name) return true;
            }

            return false;
        }

        /* possible infos:
            'name' => servername
            'players' => plaayercount
            'maxplayers' => maxplayercount
            'gamemode' => gamemode name
            'password' => password (yes = 1/no = 0)
        */
        public function getInfo($info = '') {
            if(!$this->isOnline()) return false;
            if(!$this->sInfo) {
                if(!$r = $this->sendPacket('M2MPi')) return false;

                $i = explode('@', $r);
                $this->sInfo = array('name' => $i[0], 'players' => $i[1], 'maxplayers' => $i[2], 'gamemode' => $i[3], 'password' => $i[4]);
            }

            return ($info === '') ? ($this->sInfo) : ($this->sInfo[$info]);
        }

        /* get ping */
        public function getPing() {
            if(!$this->sPing) {
                $start = microtime(true);
                if(!$this->sendPacket('M2MPp')) return 0;
                $this->sPing = round((microtime(true)-$start) * 1000, 0);
            }

            return ($this->sPing > 0 && $this->sPing < 2000) ? ($this->sPing) : (0);
        }

        /* used for sending packets, you can send custom packets directly from your object */
        public function sendPacket($packet) {
            fputs($this->sSocket, $packet);
            if(!$r = fread($this->sSocket, 1024)) return false;

            return trim(str_replace($packet.'@', '', $r), '\x00');
        }

        /*
            SINGLETON
                        */

        public static function getInstance($ip, $port = 27015) {
            if($port = -1) $port = 27015;

            if(!self::$instance) self::$instance = new self($ip, $port);

            return self::$instance;
        }

        public static function info($info = '', $ip = -1, $port = 27015) {
            if($port === -1) $port = 27015;

            if(!self::$instance) {
                if($ip === -1) return false;
                self::$instance = new self($ip, $port);
            }

            return self::$instance->getInfo($info);
        }

        public static function players($ip = -1, $port = 27015) {
            if($port = -1) $port = 27015;

            if(!self::$instance) {
                if($ip === -1) return false;
                self::$instance = new self($ip, $port);
            }

            return self::$instance->getPlayers();
        }

        public static function online($ip = -1, $port = 27015) {
            if($port = -1) $port = 27015;

            if(!self::$instance) {
                if($ip === -1) return false;
                self::$instance = new self($ip, $port);
            }

            return self::$instance->isOnline();
        }

        public static function ping($ip = -1, $port = 27015) {
            if($port = -1) $port = 27015;

            if(!self::$instance) {
                if($ip === -1) return false;
                self::$instance = new self($ip, $port);
            }

            return self::$instance->getPing();
        }

        public static function playerOnline($name, $ip = -1, $port = 27015) {
            if($port = -1) $port = 27015;

            if(!self::$instance) {
                if($ip === -1) return false;
                self::$instance = new self($ip, $port);
            }

            return self::$instance->isPlayerOnline($name);
        }
    }
?>