julienmonnerie/kirby/bootstrap.php

<?php

/**
 * Validate the PHP version to already
 * stop at older or too recent versions
 */
if (
	version_compare(PHP_VERSION, '8.1.0', '>=') === false ||
	version_compare(PHP_VERSION, '8.4.0', '<')  === false
) {
	die(include __DIR__ . '/views/php.php');
}

if (is_file($autoloader = dirname(__DIR__) . '/vendor/autoload.php')) {
	/**
	 * Always prefer a site-wide Composer autoloader
	 * if it exists, it means that the user has probably
	 * installed additional packages
	 *
	 * @psalm-suppress MissingFile
	 */
	include $autoloader;
} elseif (is_file($autoloader = __DIR__ . '/vendor/autoload.php')) {
	/**
	 * Fall back to the local autoloader if that exists
	 *
	 * @psalm-suppress MissingFile
	 */
	include $autoloader;
} else {
	/**
	 * If neither one exists, don't bother searching;
	 * it's a custom directory setup and the users need to
	 * load the autoloader themselves
	 */
}