Util::trim

static function trim($arg)
{
	$arg = (string) $arg;
	if($arg == '')
	{
		return $arg;
	}

	$arg = trim($arg);
	// remove that annoying undying sequences from wysiwyg
	$pattern = '/(^((x20)?(xc2)?xa0(x20)?)+|((x20)?(xc2)?xa0(x20)?)+$)/';
	if (LANG_CHARSET == 'UTF-8')
	{
		$pattern .= 'u';
	}
	$arg = preg_replace($pattern, '', $arg);

	return $arg;
}