_wp_expand_nav_menu_post_data

WordPress Version: 5.4

/**
 * If a JSON blob of navigation menu data is in POST data, expand it and inject
 * it into `$_POST` to avoid PHP `max_input_vars` limitations. See #14134.
 *
 * @ignore
 * @since 4.5.3
 * @access private
 */
function _wp_expand_nav_menu_post_data()
{
    if (!isset($_POST['nav-menu-data'])) {
        return;
    }
    $data = json_decode(stripslashes($_POST['nav-menu-data']));
    if (!is_null($data) && $data) {
        foreach ($data as $post_input_data) {
            // For input names that are arrays (e.g. `menu-item-db-id[3][4][5]`),
            // derive the array path keys via regex and set the value in $_POST.
            preg_match('#([^\[]*)(\[(.+)\])?#', $post_input_data->name, $matches);
            $array_bits = array($matches[1]);
            if (isset($matches[3])) {
                $array_bits = array_merge($array_bits, explode('][', $matches[3]));
            }
            $new_post_data = array();
            // Build the new array value from leaf to trunk.
            for ($i = count($array_bits) - 1; $i >= 0; $i--) {
                if (count($array_bits) - 1 == $i) {
                    $new_post_data[$array_bits[$i]] = wp_slash($post_input_data->value);
                } else {
                    $new_post_data = array($array_bits[$i] => $new_post_data);
                }
            }
            $_POST = array_replace_recursive($_POST, $new_post_data);
        }
    }
}