Autoloader

autoloader.php

<?php

/**
 * Autoload class files on demand
 *
 * `Dokan_Installer` becomes => installer.php
 * `Dokan_Template_Report` becomes => template-report.php
 *
 * @param string $class requested class name
 */
function dokan_autoload( $class ) {
    if ( stripos( $class, 'Dokan_' ) !== false ) {
        $class_name = str_replace( array('Dokan_', '_'), array('', '-'), $class);
        $file_path = __DIR__ . '/classes/' . strtolower( $class_name ) . '.php';

        if ( file_exists( $file_path ) ) {
            require_once $file_path;
        }
    }
}

spl_autoload_register( 'dokan_autoload' );