Build a comma separated string of one or more strings

build-comma-separated-string.php

<?php
/**
 * Build Comma-Separated String
 * Won't add a hanging comma if there's only passed value
 */
function comma_separated($array) {
    $string = implode(', ', $array);
    if (preg_match("/, $/", $string)) { // if it ends in a comma, remove the comma
        $string = substr($string, 0, -2);
    }
    return $string;
}