PHP IRC Snoop/Relay Bot

<?php

/** PHP IRC Snoop/Relay Bot **
 *
 *  ####TODO: Think and then some..
 *  ####TODO: THINK of extras.
 */

$sbot = SnoopBot::getInst();

$sbot->config = array(
        'mode'      => 'relay',       /// SNOOP OR RELAY
        'serv'      => 'localhost',
        'port'      => 6667,
        'nick'      => 'Nickeroo',
        'name'      => 'MrRooo',
        'chan'      => array('#chan'),
        'nick_ignore'=> array('nigger')
        );

$sbot->Init();

###########################################################
class SnoopBot
{
    private $is_CLI = false;
    private $socket = null;
    private $ex     = null;
    private $tstamp = '0000-00-00 00:00:00';

    private $nicks  = array();
    private $chans  = array();

    private $curruser = null;
    private $currchan = null;
    private $lastchan = null;

    private $userwhois = null;

    public $config  = array(
        'mode'          => 'snoop',             # Bot Mode Snoop OR Relay
        'serv'          => 'please.change.me',  # Bot Serv
        'port'          => 6667,                # Bot Port
        'nick'          => 'sbot',              # Bot Nick
        'name'          => 'RelayBot',          # Bot Name
        'chan'          => array('#chan1'),     # Chan to join
        'nick_ignore'   => array('nigger')      # Nicks to Ignore
        );

    public static function getInst()
    {
        static $inst = null;
        if ($inst === null)
        {
            $inst = new self;
        }
        return $inst;
    }

    // Initital functions
    public function init()
    {
        // Start connection to IRC
        $this->socket = fsockopen($this->config['serv'], $this->config['port']);

        // Send USER/NICK to IRC
        $this->sendData('USER', "{$this->config['nick']} irc.land {$this->config['nick']} :{$this->config['name']}\r\n");
        $this->sendData('NICK', "{$this->config['nick']}\r\n");

        while(true)
        {
            // Timestamps
            $this->tstamp = (new \DateTime())->format('H:i:s');
            // Bot Core
            $this->ex = $this->recvData();

            // Play Ping-Pong
            if($this->ex[0] == 'PING')
            {
                $this->sendData('PONG', "{$this->ex[1]}");
            }

            // Set Current User/Chan
            $this->curruser = substr(explode('!', $this->ex[0])[0], 1);
            $this->currfunc = @$this->ex[1];
            $this->currchan = @$this->ex[2];

            // Switch Functions
            $this->preSwitches();

            if($this->config['mode'] == 'relay')
            {
                $this->doRelay();
            }
            $this->lastchan = $this->currchan;
        } // While(true)
    }

    // Initital Core functions
    private function preSwitches()
    {
        // preSwitches include Pre commands, and post nick/join/kick/part/quit
        switch(@$this->ex[1])
        {
            case '001':  // Check for time to join
                if(is_array($this->config['chan']))
                {
                    foreach($this->config['chan'] as $chan)
                    {
                        $this->sendData('JOIN', "$chan\r\n");
                    }
                }
                else
                {
                    $this->sendData('JOIN', "{$this->config['chan']}\r\n");
                }
            break;
            #####################
            case '311': // Fetch Whois Info
                $ex = $this->ex;
                unset($ex[0], $ex[1], $ex[2], $ex[6], $ex[7]);
                $this->userwhois = $ex;
            break;
            #####################
            case '353': // Fetch Nicks from Channel
                $ex = $this->ex;
                $chan = $ex[4];
                unset($ex[0], $ex[1], $ex[2], $ex[3], $ex[4]);
                $nicks = implode(' ', $ex);
                $nicks = str_replace(':', '', $nicks);
                $nicks = str_replace('@', '', $nicks);
                $this->nicks[$chan] = explode(' ', ucwords($nicks));
            break;
            #####################
            case '433': // Set random nick, if Nick inuse
                $randId = substr(mt_rand(), 0, strlen(mt_rand())/2);
                $this->sendData('NICK', "{$this->config['nick']}$randId\r\n");
            break;
            #####################
            case 'NICK': // Update Nicks array on Nick Change
                $olduser = trim(ucwords(str_replace(':', '', explode("!", substr($this->ex[0], 1))[0])));
                $newuser = trim(ucwords($this->ex[2]));
                if($olduser == ucwords($this->config['nick']))
                {
                    $this->sendData('NICK', "{$this->config['nick']}\r\n");
                }
                foreach($this->chans as $chan)
                {
                    foreach($this->nicks[$chan] as $nickId => $nick)
                    {
                        if($olduser == $nick)
                        {
                            $this->nicks[$chan][$nickId] = $newuser;
                        }
                    }
                }
            break;
            #####################
            case 'PRIVMSG':
                //echo "PRIVMSG\r\n";
                if($this->config['mode'] == 'snoop')
                {
                    $user = substr(explode('!', $this->ex[0])[0], 1);
                    if(!in_array($user, $this->config['nick_ignore']))
                    {
                        $this->doSnoop('PRIVMSG');
                    }
                }
                else
                {
                    $this->doRelay();
                }
            break;
            #####################
            case 'JOIN':
                if($this->config['mode'] == 'snoop')
                {
                    $this->doSnoop('JOIN');
                }
                $chan = trim(strtolower(substr($this->ex[2], 1)));
                $user = trim(ucwords(explode("!", substr($this->ex[0], 1))[0]));
                $this->chans[$chan] = $chan;
                $this->nicks[$chan][] = $user;
            break;
            #####################
            case 'KICK':
                if($this->config['mode'] == 'snoop')
                {
                    $this->doSnoop('PRIVMSG');
                }
                $this->sendData('JOIN', "{$this->ex[2]}\r\n");
            break;
            #####################
            case 'PART':
                if($this->config['mode'] == 'snoop')
                {
                    $this->doSnoop('PART');
                }
                $olduser = trim(ucwords(str_replace(':', '', explode("!", substr($this->ex[0], 1))[0])));
                $this->currchan = trim($this->currchan);
                foreach($this->nicks[$this->currchan] as $nickId => $nick)
                {
                    if($olduser == $nick)
                    {
                        unset($this->nicks[$this->currchan][$nickId]);
                    }
                }
            break;
            #####################
            case 'QUIT':
                if($this->config['mode'] == 'snoop')
                {
                    $this->doSnoop('QUIT');
                }
                $olduser = trim(ucwords(str_replace(':', '', explode("!", substr($this->ex[0], 1))[0])));
                foreach($this->chans as $chan)
                {
                    foreach($this->nicks[$chan] as $nickId => $nick)
                    {
                        if($olduser == $nick)
                        {
                            unset($this->nicks[$chan][$nickId]);
                        }
                    }
                }
            break;
        }
    }

    private function doSnoop($func = 'PRIVMSG')
    {
        //echo "SNOOP\r\n";
        $ex = $this->ex;
        switch($func)
        {
            case 'JOIN':
                unset($ex[0]);
                $this->currchan = trim(substr($this->currchan, 1));
            break;
            case 'PART':
                unset($ex[0]);
            break;
            case 'QUIT':
                unset($ex[0]);
                $this->currchan = $this->lastchan;
            break;
            case 'PRIVMSG':
                unset($ex[0], $ex[1], $ex[2]);
            break;
        }
        $this->writeLog(implode(" ", $ex), $this->currchan);
    }

    private function doRelay()
    {
        //echo "RELAY\r\n";
        foreach($this->chans as $chan)
        {
            if(file_exists("xferchans/$chan"))
            {
                $data = trim(file_get_contents("xferchans/$chan"));
                foreach(explode("\n", $data) as $line)
                {
                    //echo "$line\r\n";
                    $this->sendData("PRIVMSG $chan :", "$line\r\n");
                }
                unlink("xferchans/$chan");
            }
        }
    }

    // Send/Recv/Log Functions
    private function sendData($command, $message = null)
    {
        echo 'SND-MSG: ';
        if($message == null)
        {
            echo "$command" . PHP_EOL;
            fputs($this->socket, (string)"$command\r\n");
        }
        else
        {
            echo "$command -> $message" . PHP_EOL;
            fputs($this->socket, (string)"$command $message\r\n");
        }
    }

    private function recvData()
    {
        $data = fgets($this->socket, 1024);
        if($data != '')
        {
            echo "RCV-MSG: $data" . PHP_EOL;
        }
        return explode(' ', $data);
    }

    private function writeLog($input = null, $chan = null)
    {
        $input = trim($input);
        $user = substr(explode('!', $this->ex[0])[0], 1);
        echo "SYS-MSG: Append Log: $chan -> <$user> $input" . PHP_EOL . PHP_EOL;
        file_put_contents("xferchans/$chan", (string)"4,0{$this->tstamp} {$this->config['serv']}:{$this->config['port']} -> <$user> $input" . PHP_EOL, FILE_APPEND);
    }
}