slugify

slugify.php

<?php

/**
 * Slugify a string.
 * 
 * Convert "Hello, world! It's Craig in 2012." to "hello-world-its-craig-in-2012".
 * See test_slugify for more examples.
 * 
 * @author Craig Anderson <craiga@craiga.id.au>
 * @link https://gist.github.com/2716157
 */
function slugify($s)
{
	$s = iconv(mb_detect_encoding($s), "ascii//TRANSLIT//IGNORE", $s); // transliterate to ASCII
	$s = preg_replace("/['^]/", "", $s); // remove accents
	$s = preg_replace("/[^a-zA-Z0-9]/", "-", $s); // replace non-word characters
	$s = preg_replace("/\-+/", "-", $s); // remove double-hyphens
	$s = trim($s, "-"); // remove start and end hyphens
	$s = strtolower($s); // lowercase
	return $s;
}

/**
 * Assert that slugify works as expected.
 */
function test_slugify()
{
	function assert_slugify_result($input, $expected)
	{
		$fail = false;
		$actual = slugify($input);
		if($actual != $expected)
		{
			printf("\nFAIL!\nslugify(\"%s\") != \"%s\"\nslugify(\"%s\") == \"%s\"\n", $input, $expected, $input, $actual);
			$fail = true;
		}
		return $fail;
	}
	
	$numFails = 0;
	$numFails += assert_slugify_result("Hello, World! It's Craig in 2012.", "hello-world-its-craig-in-2012");
	$numFails += assert_slugify_result("Bonjour Café", "bonjour-cafe");
	$numFails += assert_slugify_result("€200", "eur200");
	$numFails += assert_slugify_result("Fußball", "fussball");
	printf("\nTests completed. %d test%s failed.\n", $numFails, $numFails != 1 ? "s" : "");
}