Generate Slug PHP (Safe/clean urls) Original resource: https://stackoverflow.com/a/2955878/4717533

slug.php

<?php
echo slugify('Hello World///&?Welcome');   // hello-world-welcome


/**
 * Generates a slug from the given string
 * @param $input The input string
 * @param string $replacement The character/string to use as the replacement value
 * @return mixed|string
 */
function slugify($input, $replacement = '-') {
    if (empty($input)) return '';
    // replace non letter or digits
    $input = preg_replace('~[^\pL\d]+~u', $replacement, $input);    // tilde is only used as a delimiter instead of '/'
    // transliterate
    $input = iconv('utf-8', 'us-ascii//TRANSLIT', $input);
    // remove unwanted characters
    $input = preg_replace('~[^'.$replacement.'\w]+~', '', $input);
    // trim
    $input = trim($input, $replacement);
    // remove duplicate/multiple consecutive $replacement instances
    $input = preg_replace('~'.$replacement.'+'.'~', $replacement, $input);
    // lowercase
    return strtolower($input);
}