Super Simple Seo Friendly Slug In PHP

better-slug-php.php

<?php    
    /**
     * @param $string
     * @param string $separator
     * @return string
     * @author DevsrealmGuy
     */
    public function slug($string, string $separator = '-'): string
    {
        #
        # Replace chars and trim before it gets to Transliterator
        #
        $string = trim(
            str_replace(
                search: ['&', '@', '%', '$', '*', '<', '>', '+', '-'],
                replace: [' and ', ' at ', ' percentage ', ' dollar ',
                ' asterisk ', ' less than ', ' greater than ', ' plus ', ' minus '],
                subject: $string)
        );

        #
        # You can use simple regex like so: '::[^A-Za-z0-9_] Remove;' would remove any character that isn't alphanumeric and underscore
        #
        # I have no idea why complex regex ain't working though :(
        #
        $rules = '::Lower(); ::[:Punctuation:] Remove; ::Any-Latin; ::NFD; ::[:Nonspacing Mark:] Remove; ::NFC;';
        $slug = \Transliterator::createFromRules(rules: $rules);
        # replace whitespaces or space with separator
        return preg_replace(
            pattern: '/[^\S]+/',
            replacement: $separator,
            subject: $slug->transliterate($string));
    }

    /**
     * TEST SLUG:
     *
     * $this->slug('Hey ThiS     IS Cool &   YOU KNOW IT  ', '-')
     * "hey-this-is-cool-and-you-know-it"
     *
     * $this->slug('PLAYING WITH SYMBOLS: $,&,*,<,>,+,@,-,%', '-')
     * "playing-with-symbols-dollar-and-asterisk-less-than-greater-than-plus-at-minus-percentage"
     *
     * $this->slug('嘿，伙计，你过得好吗', '-')
     * "hei-huo-ji-ni-guo-de-hao-ma"
     *
     *  $this->slug('調子はどうだい、元気だといいな', '-'),
     *  "diao-zihadoudai-yuan-qidatoiina"
     */