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Symfony debugger

On your local development environment you will see the Symfony debug bar which displays:
Symfony debugger
  • HTTP status code
  • Matching route
  • Page generation time and memory usage
  • Twig template generation time

Inspecting template variables

The controller defines the variables to pass onto the view. Example controller code:
return $this->render('news/article.html.twig', [
'url' => sprintf('/news/%s', $slug),
'page' => $page
You can then inspect the variable via the dump() command.
When used in your template, this will output the variable directly to the page. E.g.
{{ dump(page) }}
Inspecting a variable via debug (in a template)
The above example shows the page object which represents, in this instance, a news post from WordPress.
The inspector shows the object types for each content field, you can find out more about these at Content Fields.

Inspecting variables in PHP

You can also use the dump() function in PHP, this will output the variable to the Symfony debugger inspector. E.g.
Select the inspector icon
Inspector icon
to inspect the variable.
Inspecting a variable via debug (in PHP)
The example above also shows the debug bar with an error, additional information such as the error details can be accessed from here.