SlugService.php

<?php
 
class SlugService
{
    public function slugify($string)
    {

        $sep = '-';
        
        // Replace special chars with hyphen
        $arr = array_map(function ($val) {
            return preg_replace('/[^a-zA-Z0-9.]+/','-',$val);
        }, str_split($string));
        
        // Remove first char hyphen
        $arr = array_filter($arr, function ($val, $i) use ($sep, $arr) {
            return !($val == $sep && $i == 0);
        }, ARRAY_FILTER_USE_BOTH);
        
        // Remove last char hyphen
        $arr = array_filter($arr, function ($val, $i) use ($sep, $arr) {
            return !($val == $sep && $i == count($arr) - 1);
        }, ARRAY_FILTER_USE_BOTH);
        
        // Remove duplicate hyphen
        $arr = array_filter($arr, function ($val, $i) use ($sep, $arr) {
            $lastVal = $i != 0 ? $arr[$i - 1] : null;
            return !($val == $sep && $val == $lastVal);
        }, ARRAY_FILTER_USE_BOTH);
        
        
        return strtolower(implode('', $arr));
    }
}
?>