public static function highlight($strString, $strPhrase, $strOpeningTag='<strong>', $strClosingTag='</strong>')
	{
		if ($strString == '' || $strPhrase == '')
		{
			return $strString;
		}

		return preg_replace('/(' . preg_quote($strPhrase, '/') . ')/i', $strOpeningTag . '\\1' . $strClosingTag, $strString);
	}