image resize zf2

Question

I need to implement image resize functionality (preferably with gd2 library extension) in zend framework 2.

I could not find any component/helper for the same. Any references?

If i want to create one, where should I add it. In older Zend framework, there was a concept of Action Helper, what about Zend framework 2 ?

Please suggest the best solution here.

Answer 1

I currently use Imagine together with Zend Framework 2 to handle this.

1. Install Imagine: php composer.phar require imagine/Imagine:0.3.*

2. Create a service factory for the Imagine service (in YourModule::getServiceConfig):

   return array(
       'invokables' => array(
           // defining it as invokable here, any factory will do too
           'my_image_service' => 'Imagine\Gd\Imagine',
       ),
   );
   

3. Use it in your logic (hereby a small example with a controller):

   public function imageAction()
   {
       $file    = $this->params('file'); // @todo: apply STRICT validation!
       $width   = $this->params('width', 30); // @todo: apply validation!
       $height  = $this->params('height', 30); // @todo: apply validation!
       $imagine = $this->getServiceLocator()->get('my_image_service');
       $image   = $imagine->open($file);
   
       $transformation = new \Imagine\Filter\Transformation();
   
       $transformation->thumbnail(new \Imagine\Image\Box($width, $height));
       $transformation->apply($image);
   
       $response = $this->getResponse();
       $response->setContent($image->get('png'));
       $response
           ->getHeaders()
           ->addHeaderLine('Content-Transfer-Encoding', 'binary')
           ->addHeaderLine('Content-Type', 'image/png')
           ->addHeaderLine('Content-Length', mb_strlen($imageContent));
   
       return $response;
   }
   

This is obviously the "quick and dirty" way, since you should do following (optional but good practice for re-usability):

1. probably handle image transformations in a service
2. retrieve images from a service
3. use an input filter to validate files and parameters
4. cache output (see http://zend-framework-community.634137.n4.nabble.com/How-to-handle-404-with-action-controller-td4659101.html eventually)

Related: Zend Framework - Returning Image/File using Controller

Answer 2

Use a service for this and inject it to controllers needing the functionality.