Append/prepend multiple files to template file in ProcessWire

multiplePrependAppendFiles.php

<?php namespace ProcessWire;

wire()->addHookBefore('PageRender::renderPage', function (HookEvent $e) {
    /** @var Page $page */
    /** @var HookEvent $event */
    /** @var Template $template */

    $event = $e->arguments(0);
    $options = $event->arguments(0);
    $page = $event->object;
    $template = $page->template;
    if (!isset($options['prependFiles'])) $options['prependFiles'] = [];
    if (!isset($options['appendFiles'])) $options['appendFiles'] = [];

    // do not overwrite previous appends prepends
    $options['prependFiles'] = array_merge($options['prependFiles'], [
        "{$template}.routes.php",
        "_common.php",
    ]);
    $options['appendFiles'] = array_merge($options['appendFiles'], [
        "views/{$template}.php",
        "_after.php",
        "_main.php",
    ]);

    $event->setArgument(0, $options);
});