Convert string to url string

Xodoa_Helper::toUrl

	/**
	 * Transforms a string to a valid url parameter
	 *
	 * @param string $string String to transform to valid url
	 * @param int $limit Max length of return string. Default is 255, because url shouldn't be longer
	 * @return string
	 */
	public static function toUrl($string, $limit = 255) {
		$string = self::toAscii($string, true);
		$string = str_replace('.', '-', $string);

		$string = substr($string, 0, $limit);

		return $string;
	}

	/**
	 * Transform a string to ascii signs (and "-")
	 * Usable if a string should be shown in url
	 *
	 * @param string $string String to transform
	 * @param boolean $lowerCase OPTIONAL True if output string should be lower case
	 * @return string Ascii String
	 */
	public static function toAscii($string, $lowerCase = true) {
		// removes white spaces
		$string = trim($string);

		// Split up all special signs like ä in two characters
		$string = iconv('UTF-8', 'ASCII//TRANSLIT//IGNORE', $string);

		// Replace white spaces by dashes
		$string = str_replace(' ', '-', $string);

		// Make string lower case
		if ($lowerCase) {
			$string = mb_strtolower($string);
		}

		// Remove all signs that are not \w or dashes or dots
		$string = preg_replace('/([^\w-\.])/', '', $string);

		return $string;
	}