Magento 2: Captcha overwrite fatal error on PHP 7

Question

Magento 2: How to override Zend library files function only?

I overwrite Captcha module on my WAMP PHP 5.X & it works fine.

On linux server which has PHP 7 gives below error

Fatal error: Declaration of Custom\Captcha\Model\CustomCaptcha::render(Custom\Captcha\Model\Zend_View_Interface $view = NULL, $element = NULL) must be compatible with Zend_Captcha_Adapter::render(Zend_View_Interface $view = NULL, $element = NULL) in /var/www/html/magento/app/code/Custom/Captcha/Model/CustomCaptcha.php on line 156 Segmentation fault (core dumped)

Answer 1

Looks like Zend_View_Interface class does not imported in your scope.

You can use import in top of you file:

use Zend_Captcha_Image; 

Or use full class name

public function render(\Zend_View_Interface $view = NULL, $element = NULL)