Facade Emulator

Db.php

<?php

namespace app\classes;

/**
 * Description of Db
 *
 * @author Misbahul D Munir <[email protected]>
 * @since 1.0
 */
class Db extends Facade
{
    
}

Facade.php

<?php

namespace app\classes;

use yii\helpers\StringHelper;

/**
 * Description of Facade
 *
 * @author Misbahul D Munir <[email protected]>
 * @since 1.0
 */
class Facade
{
    private static $_providers = [];

    /**
     * @return \yii\base\Object
     */
    protected static function provider()
    {
        return \Yii::$app->get(lcfirst(StringHelper::basename(get_called_class())));
    }

    public static function __callStatic($name, $arguments)
    {
        $instance = static::instance();
        return call_user_func_array([$instance, $name], $arguments);
    }

    public static function instance()
    {
        $class = get_called_class();
        if (isset(self::$_providers[$class])) {
            return self::$_providers[$class];
        } else {
            return self::$_providers[$class] = static::provider();
        }
    }
}