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Run your legacy applications within Laminas.

Introduction

Since rewriting your legacy application from scratch to a Laminas application could be nearly impossible due to time, effort, and resources, I was searching for a way to migrate a legacy application to a Laminas application.

A great article by Chris Abernethy described a way on how to run your legacy application within ZF1, so I migrated this HowTo to a small Laminas module, to be able to run a legacy application within Laminas.

While running your legacy application within a Laminas application it is possible to slowly migrate an existing application to Laminas by leaving your old application (nearly - see "Adjust your legacy Application") untouched and build new modules with the power of Laminas.
By adding a simple wrapper (see "Using Laminas within your legacy application") you could also use the new modules within your legacy application.

Installation

Install through composer

{
 "require" : {
 "maglnet/magl-legacy-application" : "*"
 }
}

Enable the module within your Laminas application.config.php

 'modules' => array(
 'Application',
 'MaglLegacyApplication',
 ),

Copy the provided file data/magl-laminas-legacy-wrapper.php to your public/ folder.
Copy the provided file data/.htaccess to your publix folder.
Copy your legacy Application to your public/ folder.

Your legacy application should now run within Laminas. :)

Configuration

For any SEO optimized route within your legacy application, add a route to the zend router that routes to legacy controller and remove the mod_rewrite rules from your .htaccess

return array(
 'router' => array(
 'routes' => array(
 // example for transferring mod rewrite rules to laminas routes
 'legacy-seo-calendar' => array(
 'type' => 'Laminas\Mvc\Router\Http\Regex',
 'options' => array(
 'regex' => '/calendar/(?<foo>.+)',
 'defaults' => array(
 'controller' => 'MaglLegacyApplication\Controller\Legacy',
 'action' => 'index',
 'script' => 'index-already-seo-optimized.php',
 ),
 'spec' => '/',
 ),
 ),
 ),
 ),
);

Adjust your legacy Application

There are several cases in which your legacy application won't run without additional adjustments, here are some of them:

Relative Paths

Using relative paths for require, require_once or includes will possibly fail now, since Laminas will do a chdir() to the Laminas' application root. So you will need to adjust your paths to match the new root.

Example:

include '../lib/somelib.php';

should be changed to:

include __DIR__ . '/../lib/somelib.php';

Using Globals / Server SCRIPT_FILENAME or SCRIPT_NAME

Because of mod_rewrite rules, SCRIPT_FILENAME and SCRIPT_NAME won't be your real script anymore. If you use these variables, you need to adjust these places within your legacy application:

Example:

$script_filename = $_SERVER['SCRIPT_FILENAME'];
$script_name = $_SERVER['SCRIPT_NAME'];

should be changed to:

use MaglLegacyApplication\Application\MaglLegacy;
$legacy = MaglLegacy::getInstance();
$script_filename = $legacy->getLegacyScriptFilename();
$script_name = $legacy->getLegacyScriptName();

Using Laminas within your legacy application

use MaglLegacyApplication\Application\MaglLegacy;
$application = MaglLegacy::getInstance()->getApplication();
$yourService = $application->getServiceManager()->get('YourService');

Injecting responses from within your legacy application

from wherever you are within your legacy application, it is possible to bypass your legacy applications controller code and send a response to the Laminas Controller wrapper. This response will then be handled like within a normal Laminas controller.

use MaglLegacyApplication\Application\MaglLegacy;
$application = MaglLegacy::getInstance()->getApplication();
$application->getEventManager()->getSharedManager()->attach('*', MaglLegacy::EVENT_SHORT_CIRCUIT_RESPONSE, function(Event $e){
 $response = new \Laminas\Http\Response();
 $response->setStatusCode(404);
 $response->setContent('not found');
 $e->stopPropagation(true);
 return $response;
});

Contributing

If you have questions or problems regarding this module just open an issue or, even better, solve it and open a pull request. 👍