App\Helpers\Helper.php

<?php

namespace App\Helpers;

class Helper {
    public static function bn_slug($string = null, $separator = "-") {
        if (is_null($string)) {
            return "";
        }
        // Remove spaces from the beginning and from the end of the string
        $string = trim($string);
        // Lower case everything
        // using mb_strtolower() function is important for non-Latin UTF-8 string | more info: http://goo.gl/QL2tzK
        $string = mb_strtolower($string, "UTF-8");;
        // Make alphanumeric (removes all other characters)
        // this makes the string safe especially when used as a part of a URL
        // this keeps latin characters and bengali charactrs as well
        $string = preg_replace("/[^a-z0-9_\s-অআইঈউঊঋৠঌৡএঐওঔকখগঘঙচছজঝঞটঠডঢণতথদধনপফবভমযরলশষসহড়ঢ়য়ৰৱঁংঃ়ািীুূৃৄেৈোৌ্ৗ০১২৩৪৫৬৭৮৯৲৳৴৵৶৷৸৹৺]/u", "", $string);
        // Remove multiple dashes or whitespaces
        $string = preg_replace("/[\s-]+/", " ", $string);
        // Convert whitespaces and underscore to the given separator
        $string = preg_replace("/[\s_]/", $separator, $string);
        return $string;
    }
}