Split a comma separated string into an array.

array_commas.php

<?php
if (!function_exists('array_commas')) {
    /**
     * Split a comma separated string into an array.
     * @param string $str
     * @return array
     */
    function array_commas(string $str): array
    {
        $str = explode(',', $str);
        $str = array_map('trim', $str);
        return array_filter($str);
    }
}