Ubilling/api/api.autolader.php

<?php

//Register and load file classes 
spl_autoload_register(function ($className) {

    $api_directory = 'api' . DIRECTORY_SEPARATOR;
    $libs_directory = 'libs' . DIRECTORY_SEPARATOR;
    $venor_directory = 'vendor' . DIRECTORY_SEPARATOR;

    // Defined path
    $classFileName = strtolower($className);

    $apiClassFileName = $api_directory . $libs_directory . 'api.' . $classFileName . '.php';
    $vendorClassFileName = $api_directory . $venor_directory . strtolower($className) . DIRECTORY_SEPARATOR . $classFileName . '.php';


    if (strpos($className, 'nya_') !== false) {
        $notOrmTable = str_replace("nya_", '', $className);

        $exec = '
            class ' . $className . ' extends NyanORM {
                public function __construct() {
                  parent::__construct();
                   $this->tableName = "' . $notOrmTable . '";
                 }
             }';

        eval($exec); //automatic models generation
    } else {
        if (file_exists($apiClassFileName)) {
            include $apiClassFileName;
        } elseif (file_exists($vendorClassFileName)) {
            include $vendorClassFileName;
        }
    }
});