[PHP] Code error ครับ ช่วยทีครับ เข้าเว็บไม่ได้เลย ... Fatal error: Can't use method return value in write context in

<?PHP
require_once('config.class.php');
class function_class extends config
{
	public $mysql = false;
	
	public function __construct()
	{
		ob_start();
		session_start();
		$this->mysqlfunc('connect');
		foreach($_POST as $var1 => $var2)
		{
			if(is_string($var2) || is_numeric($var2))
			{
				$_POST[$var1] = $this->mysqlfunc('real_escape_string', $var2);
			}
		}
	}
	
	public function __destruct()
	{
		require('footer.inc.php');
		$this->mysqlfunc('close');
	}
	
	public function mysqlfunc($par1, $par2 = NULL)
	{
		$var1 = false;
		if(empty($par2))
		{
			switch($par1)
			{
				case 'connect':
					if($this->mysql === false)
					{
						$this->mysql = @mysql_connect(self::MYSQL_HOST, self::MYSQL_USER, self::MYSQL_PASS);
						if($this->mysql !== false)
						{
							$this->mysqlfunc('query', 'USE '.self::MYSQL_DB.';');
							$this->mysqlfunc('query', 'SET NAMES '.self::MYSQL_CHAR.';');
						}
						else
						{
							exit($this->mysqlfunc('error'));
						}
					}
				break;
				case 'error':
					$var1 = mysql_error();
				break;
				case 'close':
					$var1 = mysql_close($this->mysql);
				break;
			}
		}
		else
		{
			switch($par1)
			{
				case 'query':
					$var1 = mysql_query($par2, $this->mysql);
				break;
				case 'fetch':
					$var1 = mysql_fetch_assoc($par2);
				break;
				case 'num':
					$var1 = mysql_num_rows($par2);
				break;
				case 'free':
					$var1 = mysql_free_result($par2);
				break;
				case 'real_escape_string':
					$var1 = mysql_real_escape_string($par2, $this->mysql);
				break;
			}
		}
		return $var1;
	}
	
	public function WebsendClass()
	{
		require_once('websend.class.php');
		return new websend(array(self::WEBSEND_HOST, self::WEBSEND_PASS));
	}
	
	public function isLogin()
	{
		return !empty($this->user_session());
	}
	
	public function user_session($par1 = NULL)
	{
		if(!empty($par1))
		{
			$_SESSION['user'] = $par1;
		}
		if(isset($_SESSION['user'])) return $_SESSION['user'];
	}
	
	public function hash($par1)
	{
		return sha1(md5($par1));
	}
}
?>