Sort an array / object by key

sort_by_key.php

<?php
public function sort_by_key($key, $array, $sort_by) {
    for ($i = 0; $i <= count($array) - 1; $i++) {
        if (is_object($array[$i])) {
            $array_item = $array[$i]->{$key};
        } else {
            $array_item = $array[$i][$key];
        }

        $sort[$i] = (isset($array_item)) ? strtolower($array_item) : '';
    }

    array_multisort($sort, $sort_by, $array);

    return $array;
}