String to Slug Converter

slug_helper.php

/**
 * URL Slug
 *
 * Converts an string into a formated url slug string
 *
 * @access	public
 * @param	string	str
 * @return	string	
 */
 
if (! function_exists('url_slug'))
{
	function url_slug($str)
	{
		$a = 'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûýýþÿŔŕ';
		$b = 'aaaaaaaceeeeiiiidnoooooouuuuybsaaaaaaaceeeeiiiidnoooooouuuyybyRr';
		$str = utf8_decode($str);
		$str = strtr($str, utf8_decode($a), $b);
		$str = strtolower(trim($str));
		$str = preg_replace("/[^a-z0-9-]/", "-", $str);
		$str = preg_replace("/-+/", "-", $str);

		if(substr($str, strlen($str) - 1, strlen($str)) === "-") {
			$str = substr($str, 0, strlen($str) - 1);
		}

		return utf8_encode($str);
	}
}