<?php

	function permalink($string)
	{
		$permalink = '';

		$permalink = htmlspecialchars_decode($string, ENT_QUOTES);
		$permalink = preg_replace('%[^-/+|\w ]%', '', $permalink);
		$permalink = preg_replace('/[\/_|+ -]+/', '-', $permalink);
		$permalink = strtolower(trim($permalink, '-'));

		return $permalink;
	}

	$title = 'Pepe\'nin son oyunu';

	echo permalink($title);