PHP Telnet Server with commands

telnet_server.php

<?php 
    set_time_limit(0);
    $socketMain = socket_create(AF_INET, SOCK_STREAM, 0) or die();
    socket_set_option($socketMain, SOL_SOCKET, SO_REUSEADDR, 1) or die();
    socket_bind($socketMain, '127.0.0.1', '1234') or die();
    socket_listen($socketMain, 5) or die();
    $clients = array();
    while(true){
        $read = array();
        $read[0] = $socketMain;
        foreach($clients as $x => $client){
            if($client->closed == true){
                unset($clients[$x]);
            }else{
                $read[] = $client->socket;
            }
        }
        socket_select($read, $null = null, $null = null, 5);
        if(in_array($socketMain, $read)){
            $sckNewClient = socket_accept($socketMain);
            $clients[] = new clientHandler($sckNewClient);
        }
        foreach($clients as $key => $client){
            if(in_array($client->socket, $read)){
                $client->handle($key);
            }
        }
    }
    socket_close($socketMain);

    class clientHandler{
        public $closed = false;
        public $socket = false;
        public $cmd = false;
        public $command = false;
        public $parameter = false;

        public function clientHandler($socket){
            $this->socket = $socket;
            $this->send("
            ┌───────────────────────────────────────────────────────────────────────┐
            │                   Welcome on our Telnet service                       │
            └───────────────────────────────────────────────────────────────────────┘
               To show available commands type 'help'.
            ");
        }
        
        public function handle($key){
            $cmd = $this->read();
            echo "Client: #$key: $cmd\n";
            
            if($cmd){
                @list($command, $parameter) = @explode(' ', $cmd, 2);
            }
            
            if(isset($command) && $command){
                switch($command){

                    case 'echo':
                        $this->send($parameter);;
                        break;

                    case 'time':
                        $this->send(date('Y-m-d H:i:s'));
                        break;

                    case 'dice':
                        if ( is_numeric($parameter) && $parameter > 1 )   
                            $this->send('Roll with ' . $parameter . ' dices: ' . rand( 1*$parameter, 6*$parameter ) );
                        else 
                            $this->send('Roll with one dice: ' . rand(1,6) );
                        break;

                    case 'hnews':
                        if ( is_numeric($parameter) && $parameter >= 1 )
                            $this->hnews($parameter);
                        else 
                            $this->hnews(3);
                        break;

            	    case 'ping':
                        $this->send('Pong');
                        break;

                    case 'help':
                        $this->helpMessage();
                        break;

                    case 'clear':
                        $this->send(chr(27).chr(91).'H'.chr(27).chr(91).'J');
                        break;

                    case 'quit':
                        $this->disconnect();
                        break;

                    default:
                        $this->send('unknown command');
                }
            }
        }
        
        public function helpMessage(){
            $this->send("
            ┌─────────────┬─────────────────────────────────────────────────────────┐
            │   Command   │                     Description                         │
            ├─────────────┼─────────────────────────────────────────────────────────┤
            │ quit        │ Close the connection                                    │
            ├─────────────┼─────────────────────────────────────────────────────────┤
            │ time        │ Date time                                               │
            ├─────────────┼─────────────────────────────────────────────────────────┤
            │ echo        │ Resend your message                                     │
            ├─────────────┼─────────────────────────────────────────────────────────┤
            │ ping        │ Pong                                                    │
            ├─────────────┼─────────────────────────────────────────────────────────┤
            │ dice 1      │ Roll 1 dice, or multiple                                │
            ├─────────────┼─────────────────────────────────────────────────────────┤
            │ hnews 10    │ Get latest 10 news from Hacker News (max. 500)          │
            ├─────────────┼─────────────────────────────────────────────────────────┤
            │ help        │ Help commands list                                      │
            └─────────────┴─────────────────────────────────────────────────────────┘
            ");
        }

        public function hnews($limit){
            $latest = file_get_contents("https://hacker-news.firebaseio.com/v0/topstories.json");
            $storys = json_decode($latest);
            $i = 0;
            foreach ($storys as $story) {
                $news = file_get_contents("https://hacker-news.firebaseio.com/v0/item/$story.json");
                $story = json_decode($news, true);
                @socket_write($this->socket, $story['title'] . "\n" . $story['url'] . "\n\n" );
                if (++$i == $limit) break;
            }
            $this->send('');
        }

        public function send($sMessage){
            @socket_write($this->socket, $sMessage . "\nCommand: " );
        }
        
        public function read(){
            return trim(@socket_read($this->socket, 1024));
        }
        
        public function disconnect(){
            $this->send('bye');
            $this->closed = true;
            socket_shutdown($this->socket);
            socket_close($this->socket);
        }
    }
    
    
?>