autoload.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

namespace src;

defined('MOODLE_INTERNAL') || die();

function autoload_src() {
    $directory = new \RecursiveDirectoryIterator(__DIR__);
    $iterator = new \RecursiveIteratorIterator($directory);
    $files = [];
    foreach ($iterator as $info) {
        $pathname = $info->getPathname();
        if (substr($pathname, -4) === '.php' && $pathname != __FILE__) {
            require_once($pathname);
        }
    }
}

autoload_src();