Simple slugify function for PHP. Creates a slug for the passed string, taking into account international characters as well.

output.txt

messd-up-text-just-to-stress-test-our-little-clean-url-function
pijamali-hasta-yagiz-sofore-cabucak-guvendi-saf-ve-haydut-kiz-cocugu-bin-plaj-gormus
peux-tu-maider-sil-te-plait
tank-efter-nu-forrn-vi-foser-dig-bort
aaaaaaaeceeeeiiiidnooooouuuuyssaaaaaaaeceeeeiiiidnooooouuuuyy

slugify.php

<?php

function slugify($string, $replace = array(), $delimiter = '-') {
	// https://github.com/phalcon/incubator/blob/master/Library/Phalcon/Utils/Slug.php
	if (!extension_loaded('iconv')) {
		throw new Exception('iconv module not loaded');
	}
	// Save the old locale and set the new locale to UTF-8
	$oldLocale = setlocale(LC_ALL, '0');
	setlocale(LC_ALL, 'en_US.UTF-8');
	$clean = iconv('UTF-8', 'ASCII//TRANSLIT', $string);
	if (!empty($replace)) {
		$clean = str_replace((array) $replace, ' ', $clean);
	}
	$clean = preg_replace("/[^a-zA-Z0-9\/_|+ -]/", '', $clean);
	$clean = strtolower($clean);
	$clean = preg_replace("/[\/_|+ -]+/", $delimiter, $clean);
	$clean = trim($clean, $delimiter);
	// Revert back to the old locale
	setlocale(LC_ALL, $oldLocale);
	return $clean;
}

$str1 = "Mess'd up --text-- just (to) stress /test/ ?our! `little` clean url fun.ction!?-->";
echo "<strong>" . slugify($str1) . "</strong>";
echo "<br>";
$str2 = "Pijamalı hasta yağız şoföre çabucak güvendi. Saf ve haydut kız çocuğu bin plaj görmüş.";
echo "<strong>" . slugify($str2) . "</strong>";
echo "<br>";
$str3 = "Peux-tu m'aider s'il te plaît?";
echo "<strong>" . slugify($str3) . "</strong>";
echo "<br>";
$str4 = "Tänk efter nu – förr'n vi föser dig bort";
echo "<strong>" . slugify($str4) . "</strong>";
echo "<br>";
$str5 = "ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖÙÚÛÜÝßàáâãäåæçèéêëìíîïðñòóôõöùúûüýÿ";
echo "<strong>" . slugify($str5) . "</strong>";
echo "<br>";