A quick function to create a url 'slug' from a given string.

create-a-slug.php

<?php

function convertToSlug($input)
{
	$text = preg_replace('~[^\\pL\d]+~u', '-', $input);
	$text = trim($text, '-');
	$text = strtolower($text);
	$text = preg_replace('~[^-\w]+~', '', $text);
	return $text;	
}