public static function slugify($text) {
		$text = trim($text);
		$text = str_replace(".", "", $text);
		$text = self::removeAccents($text);
		// replace non letter or digits by -
		$text = preg_replace('~[^\\pL\d]+~u', '-', $text);
		// trim
		$text = trim($text, '-');
		// lowercase
		$text = strtolower($text);
		// remove unwanted characters
		$text = preg_replace('~[^-\w]+~', '', $text);
		return $text;

	}

	public static function removeAccents($text) {
		$text = htmlentities(utf8_decode($text));
		$remove = array("&", "acute", "grave", "circ", "tilde", "uml");
		$text = str_replace($remove, "", $text);
		return $text;
	}

Put it inside an Utils class, and use it like

$slug = Utils::slugify("nothingisclear is awesome");

Anyway today i was into slugs and i surprisingly found a php simple-and-working static method for converting strings into slugs and i felt like sharing it:

/**
 * PHP "iconv" REQUIRED !!!
 * @param object $string
 * @param object $space [optional]
 * @return
 */

public static function convertStringIntoSlug($string,$space="-") {  

	if (function_exists('iconv')) {
        $string = @iconv('UTF-8', 'ASCII//TRANSLIT', $string);
    }  

    $string = strtolower(preg_replace("/[^a-zA-Z0-9 -]/","", $string));
    $string = str_replace(" ", $space, $string);

    return $string;

}

here i’ve already wrote about a good jquery alternative (written by Leo Caseiro) for doing this