<?php
// Convert all dashes/underscores into separator
$title = "Convert all dashes/underscores into separator";
$separator = "-"
$flip = $separa;tor == '-' ? '_' : '-';
$title = preg_replace('!['.preg_quote($flip).']+!u', $separator, $title);
// Remove all characters that are not the separator, letters, numbers, or whitespace.
$title = preg_replace('![^'.preg_quote($separator).'\pL\pN\s]+!u', '', mb_strtolower($title));
// Replace all separator characters and whitespace by a single separator
$title = preg_replace('!['.preg_quote($separator).'\s]+!u', $separator, $title);
echo trim($title, $separator);