friendly_title ie slugify from FuelPHP Core class Inflector

gistfile1.php

/**
 * Converts your text to a URL-friendly title so it can be used in the URL.
 * Only works with UTF8 input and and only outputs 7 bit ASCII characters.
 *
 * @param   string  the text
 * @param   string  the separator (either - or _)
 * @return  string  the new title
 */
public static function friendly_title($str, $sep = '-', $lowercase = false)
{
	// Allow underscore, otherwise default to dash
	$sep = $sep === '_' ? '_' : '-';

	// Remove tags #AC - external class, but use your own utility function here
	$str = \Security::strip_tags($str);

	// Decode all entities to their simpler forms
	$str = html_entity_decode($str, ENT_QUOTES, 'UTF-8');

	// Remove all quotes.
	$str = preg_replace("#[\"\']#", '', $str);

	// Only allow 7bit characters
	$str = static::ascii($str);

	// Strip unwanted characters
	$str = preg_replace("#[^a-z0-9]#i", $sep, $str);
	$str = preg_replace("#[/_|+ -]+#", $sep, $str);
	$str = trim($str, $sep);

	if ($lowercase === true)
	{
		$str = \Str::lower($str);
	}

	return $str;
}