Static Proxy trait

IsStaticProxy.php

<?php
/**
 * Simple static proxy trait
 *
 * Aura DI is used for lazy loading
 *
 * Set `const PROXY_IDENTIFIER = "SomeClass" in your proxy class, and use this trait.
 *
 * Call `Some\Proxy\SomeClass::register(new SomeClassInstance)` to have it register the alias.
 *
 * @license   MIT
 * @author    David Lundgren <github.com/dlundgren>
 * @copyright 2017 David Lundgren
 */
trait IsStaticProxy
{
	/**
	 * The instance of the proxy object
	 *
	 * @var object
	 */
	private static $proxyInstance;

	/**
	 * Protect the constructor
	 */
	protected function __construct()
	{}

	/**
	 * Registers the proxy instance
	 *
	 * This will add a class alias for the classes PROXY_IDENTIFIER and the instance itself
	 *
	 * @param $instance
	 */
	public static function register($instance)
	{
		class_alias(__CLASS__, static::PROXY_IDENTIFIER);
		self::$proxyInstance = $instance;
	}

	/**
	 * Calls the methods on the instance
	 *
	 * @magic
	 * @param string $name
	 * @param array  $arguments
	 * @return mixed
	 */
	public static function __callStatic($name, $arguments)
	{
		return call_user_func_array([self::proxyInstance(), $name], $arguments);
	}

	
	/**
	 * Returns the proxy instance
	 *
	 * If it's an instance of a Aura DI's LazyInterface then initialize it first
	 *
	 * @return object
	 */
	private static function proxyInstance()
	{
		if (self::$proxyInstance instanceof \Aura\Di\Injection\LazyInterface) {
			self::$proxyInstance = (self::$proxyInstance)();
		}

		return self::$proxyInstance;
	}
}