UPGRADE-PHP-TO-TWIG-TEMPLATES.md

Migrating PHP templates to Twig

Tip: if you're using VS Code, install this plugin: bajdzis.vscode-twig-pack

Basic migration

<?php
$view->extend('MauticCoreBundle:Default:content.html.php');
$view['slots']->set('mauticContent', 'mauticWebhook');
$view['slots']->set('headerTitle', $view['translator']->trans('mautic.webhook.webhooks'));
?>

// ROUTING
<a href="<?php echo $view['router']->path('/emails', ['objectAction' => 'batchDelete']); ?">Hello world!</a>

// FORMS
<?php echo $view['form']->start($form); ?>
<?php echo $view['form']->row($form['email']); ?>
<?php echo $view['form']->end($form); ?>

// PAGE ACTIONS
$view['slots']->set('actions', $view->render('MauticCoreBundle:Helper:page_actions.html.php', [
    'item'            => $item,
    'templateButtons' => [
        'edit'   => $view['security']->hasEntityAccess($permissions['webhook:webhooks:editown'], $permissions['webhook:webhooks:editother'], $item->getCreatedBy()),
        'clone'  => $permissions['webhook:webhooks:create'],
        'delete' => $view['security']->hasEntityAccess($permissions['webhook:webhooks:deleteown'], $permissions['webhook:webhooks:deleteown'], $item->getCreatedBy()),
    ],
    'routeBase' => 'webhook',
]));

// TODO add more examples

Becomes

{% extends '@MauticCore/Default/content.html.twig' %}

{% block headerTitle %}{% trans %}mautic.webhook.webhooks{% endtrans %}{% endblock %}
{% block mauticContent %}mauticWebhook{% endblock %}

{# ROUTING #}
<a href="{{ path('/emails', {objectAction: 'batchDelete'}) }}">Hello world!</a>

{# FORMS #}
{{ form_start(form) }}
{{ form_row(form.email) }}
{{ form_end(form) }}

{# PAGE ACTIONS #}
{% block actions %}
    {{- include(
        '@MauticCore/Helper/page_actions.html.twig', {
            item: item,
            templateButtons: {
                'edit': securityHasEntityAccess(
                    permissions['webhook:webhooks:editown'],
                    permissions['webhook:webhooks:editother'],
                    item.getCreatedBy()
                ),
                'clone': permissions['webhook:webhooks:create'],
                'delete': securityHasEntityAccess(
                    permissions['webhook:webhooks:deleteown'],
                    permissions['webhook:webhooks:deleteother'],
                    item.getCreatedBy()
                )
            },
            routeBase: 'webhook'
    }) -}}
{% endblock %}

{# TODO add more examples #}

Random notes

• strict_variables is enabled both in dev mode (config_dev.php) and in prod mode (config_prod.php) to help you prevent bugs in your code. See the Twig documentation for more details.

• If you extend MauticCoreBundle:Default:content.html.twig, everything HAS to be in blocks. Trying to put any HTML elements outside a block will fail with the following error:

  A template that extends another one cannot include content outside Twig blocks.

• If you need to extend a Twig template but also need to override variabes inside of it, you can use Embed(embed) instead. This tag combines the functionality of include and extends.

• You're probably used to writing if !empty($variable) {} in PHP. That checks if the variable is set and whether it is not empty. In Twig, you explicity have to write if variable is defined and variable is not empty. It's a lot more descriptive. In some cases, you can use Twig's default filter, like:

  Before:
  
  {% set nameGetter = nameGetter is defined and nameGetter is not empty ? nameGetter : 'getName' %}
  
  After:
  
  {% set nameGetter = nameGetter|default('getName') %}
  

• Regarding the default filter: pay special attention to the documented use case where false is treated as an empty value. Consider using ?? true instead of |default(true) when using the default filter on a variable that could already have a boolean value set.

• You can use text replacement with the {% trans %} tag as a built-in functionality:

  {% trans with {'%code%': status_code} %}message{% endtrans %}
  

  Alternatively, you can use the more compact |trans filter instead.:

  {{ message|trans({'%code%': status_code}) }}
  ```    
  The nice thing about using filters, is that you can chain them:
  ```
  {{ message|striptags|trans({'%code%': status_code}) }}
  ```
  

• Symfony Best Practices for Templates

• Twig for Template Designers is a good overview on creating templates.