Override Zend Library Files Function in Magento 2 – How to Guide

custommagento-2.1.3magento2overrideszend-framework

I would like to override below file

magento\vendor\magento\zendframework1\library\Zend\Captcha\Image.php

Can we do with

magento\app\code\zendframework1\library\Zend\Captcha\Image.php ?

What will be the class extends?

Following http://webkul.com/blog/overriding-rewriting-classes-magento2/

It's giving 90% answer.

magento\app\code\Zend\Captcha\Image.php

class Zend_Captcha_Image extends Zend_Captcha_Word
{
    protected function _generateImage($id, $word)
    {
    }
}

I want only this function. It gives abstract class error. If i only put this.

Can we override composer.json for this? Don't want to change in Magento Default

When u click on "Reload Captcha" it gives big DIV blank then it loads. It's not working as default works. Something still missing in override.

Best Answer

The Magento_Captcha module use Zend_Captcha_Image for generate of captcha images.

Magento\Captcha\Model\DefaultModel:

class DefaultModel extends \Zend_Captcha_Image implements \Magento\Captcha\Model\CaptchaInterface

For extending image generation functionality, you can add you custom preference on Magento\Captcha\Model\DefaultModel.

di.xml

<preference for="Magento\Captcha\Model\DefaultModel" type="Vendor\Module\Model\Captcha\MyCaptchaModel"/>

MyCaptchaModel.php:

/**
 * Class MyCaptchaModel.
 */
class MyCaptchaModel extends \Magento\Captcha\Model\DefaultModel
{
    /**
     * {@inheritdoc}
     */
    protected function _generateImage($id, $word)
    {
        //@TODO
    }
}

Alternatively, you can add plugin on \Magento\Captcha\Model\CaptchaFactory::create() and define your custom logic for creating instances of captcha models.

Related Solutions

Zend Framework – How to Override a Zend Library

all Zend classes are instantiatet directly, for example here:

app/code/core/Mage/Adminhtml/controllers/Sales/Order/ShipmentController.php:726
$page = new Zend_Pdf_Page($xSize, $ySize);

This is the reason you can't use any config.xml syntax to change the class itself with an <rewrite />

But the include path is set as expected:

/app/code/local:/app/code/community:/app/code/core:/lib:.:...

Therefore putting a Zend class in the correct path (yours is wrong) should do the trick:

app/code/local/Zend/Pdf/Page.php

Magento 2 – How to Override a Zend Class

There is no "local code pool override" mechanism anymore. Instead you can use preferences in di.xml for any class that is instantiated by the Magento object manager, i.e. used via Dependency Injection in Magento classes. This is the equivalent to a class rewrite in Magento 1.

But for classes like Zend_Date where this is not the case, this is not possible.

However you could create a composer package that loads your own Zend_Date class before the real one is loaded via autoloading:

composer.json

{
    "name": "your/custom-date",
    "autoload": {
      "files": ["src/lib/Zend/Date.php"]
    }
}

src/lib/Zend/Date.php

class Zend_Date
{
    ...
}

Edit: After you edited a composer.json file, run composer dump-autoload to update the autoloader.