gruene-seele/dev/dhl-for-woocommerce/includes/class-pr-dhl-autoloader.php

<?php

if (! defined('ABSPATH')) {
    exit;
}

class PR_DHL_Autoloader
{
    /**
     * Path to the includes directory.
     *
     * @var string
     */
    private $include_path = '';

    /**
     * The Constructor.
     */
    public function __construct()
    {

        spl_autoload_register([$this, 'autoload']);

        $this->include_path = untrailingslashit(plugin_dir_path(PR_DHL_PLUGIN_FILE)).'/includes/';
    }

    /**
     * Take a class name and turn it into a file name.
     *
     * @param  string  $class
     * @return string
     */
    private function get_file_name_from_class($class)
    {
        return 'class-'.str_replace('_', '-', $class).'.php';
    }

    /**
     * Include a class file.
     *
     * @param  string  $path
     * @return bool successful or not
     */
    private function load_file($path)
    {
        if ($path && is_readable($path)) {
            include_once $path;

            return true;
        }

        return false;
    }

    /**
     * Auto-load WC classes on demand to reduce memory consumption.
     *
     * @param  string  $class
     */
    public function autoload($class)
    {
        $class = strtolower($class);
        $file = $this->get_file_name_from_class($class);
        $path = '';

        if (strpos($class, 'pr_dhl_api') === 0) {
            $path = $this->include_path.'pr-dhl-api/';
        }

        if (strpos($class, 'front_end') !== false) {
            $path = $this->include_path.'front-end/';
        }

        // If the path is empty -> not DHL API class, or class couldn't load, try parent dir load
        if (empty($path) || ! $this->load_file($path.$file)) {
            $this->load_file($this->include_path.$file);
        }
    }
}

new PR_DHL_Autoloader;