Allow PHP Renderer to Extends other templates.

[cgaube]

Added a new function at the renderer level so that current template extends others.

e.g

template.phtml

<?php 
$this->extendsTemplate('parent_template');
?>

[template content.]

parent_template.phtml

Above template.phtml
<?php echo $this->content ?>
Under template.phtml

Will generate

Above template.phtml
[template content.]
Under template.phtml

[froschdesign]

@aft-christophe
Have you seen the concept of children for view models?

https://docs.zendframework.com/zend-view/quick-start/#nesting-view-models

[cgaube]

Hi @froschdesign
Yes I am aware of nesting view models, but unfortunately it does not work very well with applications like zend-expressive - Where you you pass a template name to the renderer
https://docs.zendframework.com/zend-expressive/v3/features/template/intro/

I know you could pass the a ViewModel with a child model as layout but it make more sense to "extends" from the template file itself.
I want to keep my handlers / controllers as detached as possible from my templating renderer (So it can be switched without much headaches).

Similar to how most of Templating systems do it out there
Twig -> https://twig.symfony.com/doc/2.x/tags/extends.html
Blade -> https://laravel.com/docs/5.7/blade#extending-a-layout
Not to sure about plates -> http://platesphp.com/v3/templates/inheritance/

How would you tackle this scenario:
I want to use a layout AND a parent template :

• template
• parent
• Layout

Thank you

[froschdesign]

@aft-christophe
Please add these kind of informations always to the description of the pull request otherwise nobody knows the reason or the motivation for your contribution. Thanks!

[cgaube]

Closing this PR -
I was able to achieve same effect by using the FilterChain from the render function instead and Custom View Helpers.

[froschdesign]

@aft-christophe
It would be good if you would add your solution here. Maybe we can use it to create a cookbook recipe for the documentation.

Thank you in advance.