make_slug.php

if (!function_exists('make_slug'))
{
	function make_slug($text)
	{
		// replace non letter or digits by -
		$text = preg_replace('~[^\\pL\d]+~u', '-', $text);
		
		// trim
		$text = trim($text, '-');
		
		// transliterate
		$text = iconv('utf-8', 'us-ascii//TRANSLIT', $text);
		
		// lowercase
		$text = strtolower($text);
		
		// remove unwanted characters
		$text = preg_replace('~[^-\w]+~', '', $text);
		
		// Remove duplicates
		$text = preg_replace('/-+/', '-', $text);
		
		if (empty($text))
		{
			return 'n-a';
		}
		
		return $text;
	}
}