database username ของ pdo นี่ กำหนดให้ใช้ความยาวได้แค่ 16 ตัวอักษรหรอครับ?

class EasyControl extends Smarty{
	 // database object
 	 var $pdo = null;
  	// smarty template object
 	 var $tpl = null;
 	 // error messages
 	 var $error = null;

  	/* database settings here! */
  	// PDO database type
  	var $dbtype = 'mysql';
  	// PDO database name
  	var $dbname ="web_database";
  	// PDO database host
  	var $dbhost = "localhost";
  	// PDO database username
 	var $dbuser = "datafoodanddrinks";
 	// PDO database password
  	var $dbpass = "foodanddrinksmaster"; 
	// PDO database charset
	var $charset = 'utf8';
	var $debug=false;
	var $sql='';
	var $rec_num=20;
	var $pageUrl="";
	var $read_table="";
	var $start_rec=0;
	var $end_rec =1;
	var $order_by='';
	var $web_base="/new_web/new2011/backoffice";#/food-drinks/backoffice
	
	
	function __construct() {
		parent::__construct();
		$this->template_dir = WEB_BASE . 'templates';
		$this->compile_dir = WEB_BASE . 'templates_c';
		$this->config_dir = WEB_BASE . 'configs';
		$this->cache_dir = WEB_BASE . 'cache';
    }
	public function EasyControl(){
		parent::EasyControl();
		$this->template_dir = WEB_BASE . 'templates';
		$this->compile_dir = WEB_BASE . 'templates_c';
		$this->config_dir = WEB_BASE . 'configs';
		$this->cache_dir = WEB_BASE . 'cache';
	}
	public function openConnect(){
		// instantiate the pdo object
    	try {
      		$dsn = "{$this->dbtype}:host={$this->dbhost};dbname={$this->dbname};charset={$this->charset}";
			echo "$dsn,$this->dbuser,$this->dbpass";
      		$this->pdo =  new PDO($dsn,"datafoodanddrinks",$this->dbpass);
			$this->pdo->query("SET NAMES '{$this->charset}'");
			$this->pdo->query("SET character_set_results={$this->charset}");
  			$this->pdo->query("SET character_set_client={$this->charset}");
  			$this->pdo->query("SET character_set_connection={$this->charset}");
			return  $this->pdo;
    	} catch (PDOException $e) {
     		 print "Error!: " . $e->getMessage();
      		die();
    	}	
	}
}

$conn = mysql_connect("localhost","datafoodanddrinks","foodanddrinksmaster");
    
    if(!$conn)
    	echo "OK";
    else
    	echo "Not Connected!";