Warning: session_start() php

Question

I m using a free domain and puted all my fails in and changed the db settings and so on and i got this error

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /srv/disk3/1618254/www/netdisk.eu.pn/mojprofil.php:2) in /srv/disk3/1618254/www/netdisk.eu.pn/core/init.php on line 2

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /srv/disk3/1618254/www/netdisk.eu.pn/mojprofil.php:2) in /srv/disk3/1618254/www/netdisk.eu.pn/core/init.php on line 2

Parse error: syntax error, unexpected '[' in /srv/disk3/1618254/www/netdisk.eu.pn/classes/DB.php on line 113

Works fine on localhost though.

My init.php:

<?php
session_start();

$GLOBALS ['config'] = array(
    'mysql' => array(
        'host' => 'asd',
        'username' => 'asd',
        'password' => 'asd',
        'db' => 'asdr'
    ),
    'remember' => array(
        'cookie_name' => 'hash',
        'cookie_expiry' => 604800
    ),
    'session' => array(
        'session_name' => 'user',
        'token_name' => 'token'
    )
);

spl_autoload_register(function($class) {
    require_once 'classes/' . $class . '.php';

});

require_once 'functions/sanitize.php';
if(Cookie::exists(Config::get('remember/cookie_name')) && !Session::exists(Config::get('session/session_name'))) {
    $hash = Cookie::get(Config::get('remember/cookie_name'));
    $hashCheck = DB::getInstance()->get('users_session', array('hash', '=', $hash));
    if($hashCheck->count()) {
        $user = new User($hashCheck->first()->user_id);
        $user->login();
    }
}
?>

and DB.php

<?php
class DB {
    private static $_instance = null;
    private $_pdo,
            $_query,
            $_error = false,
            $_results,
            $_count = 0;

    private function __construct() {
        try {
        $this->_pdo = new PDO('mysql:host=' . Config::get('mysql/host') .';dbname=' . Config::get('mysql/db'), Config::get('mysql/username'), Config::get('mysql/password'));
        } catch (PDOException $e) {
            die($e->getMessage());
        }
    }

    public static function getInstance() {
        if(!isset(self::$_instance)) {
            self::$_instance = new DB();
        }
        return self::$_instance;
    }

    public function query($sql, $params = array()) {
        $this->_error = false;
        if($this->_query = $this->_pdo->prepare($sql)) {
            $x = 1;
            if(count($params)) {
                foreach($params as$param) {
                    $this->_query->bindValue($x, $param);
                    $x++;
                }
            }
            if($this->_query->execute()) {
                $this->_results = $this->_query->fetchAll(PDO::FETCH_OBJ);
                $this->_count = $this->_query->rowCount();
            } else {
                $this->_error = true;
            }
        }
        return $this;
    }

    public function action($action, $table, $where = array()) {
        if(count($where) === 3) {
            $operators = array('=', '>', '<', '>=', '<=');

            $field     = $where[0];
            $operator  = $where[1];
            $value     = $where[2];

            if(in_array($operator, $operators)) {
                $sql = "{$action} FROM {$table} WHERE {$field} {$operator} ?";

                if(!$this->query($sql, array($value))->error()) {
                    return $this;
                }
            }
        }
        return false;
    }
    public function get($table, $where) {
        return $this->action('SELECT *', $table, $where);
    }
    public function delete($table, $where) {
        return $this->action('DELETE', $table, $where);
    }
    public function insert($table, $fields = array()) {
       $keys = array_keys($fields);
       $values = '';
       $x = 1;

       foreach($fields as $field) {
           $values .= "?";
           if($x < count($fields)) {
               $values .= ', ';
           }
           $x++;
       }

       $sql = "INSERT INTO {$table} (`" . implode('`, `', $keys) . "`) VALUES({$values})";

       if(!$this->query($sql, $fields)->error()) {
           return true;
       }
       return false;
    }
    public function update($table, $id, $fields) {
        $set = '';
        $x = 1;

        foreach($fields as $name => $value) {
            $set .= "{$name} = ?";
            if($x < count($fields)) {
            $set .= ',';
            }
            $x++;
        }

        $sql = "UPDATE {$table} SET {$set} WHERE id = {$id}";

        if(!$this->query($sql, $fields)->error()) {
            return true;
        }
        return false;
    }

    public function results() {
        return $this->_results;
    }
    public function first() {
        return $this->results()[0];
    }

    public function error() {
        return $this->_error;
    }

    public function count () {
        return $this->_count;
    }
}

?>