Fuzzy Search function - returning score

fuzzy-search.php

<?php

function fuzzy_search($search, $text, $distance = 3){

    $needles = explode(' ', mb_strtolower($search, 'UTF-8'));
    $tokens  = explode(' ', mb_strtolower($text, 'UTF-8'));
    $score   = 0;
    $levenshtein_utf8 = function ($s1, $s2) {

        $map = [];

        $utf8_to_extended_ascii = function($str) use($map) {
            // find all multibyte characters (cf. utf-8 encoding specs)
            $matches = array();
            if (!preg_match_all('/[\xC0-\xF7][\x80-\xBF]+/', $str, $matches))
                return $str; // plain ascii string
            
            // update the encoding map with the characters not already met
            foreach ($matches[0] as $mbc)
                if (!isset($map[$mbc]))
                    $map[$mbc] = chr(128 + count($map));
            
            // finally remap non-ascii characters
            return strtr($str, $map);
        };

        return levenshtein($utf8_to_extended_ascii($s1), $utf8_to_extended_ascii($s2));
    };


    foreach ($needles as $needle){

        foreach ($tokens as $token) {

            if (strpos($token, $needle) !== false) {
                $score += 1;
            } else {

                $d = $levenshtein_utf8($needle, $token);

                if ($d <= $distance) {
                    $l       = mb_strlen($token, 'UTF-8');
                    $matches = $l - $d;
                    $score  += ($matches / $l);
                }
            }
        }
        
    }

    return $score / count($needles);
}