Mastering Drupal 8

Dumping variables

While theming in Drupal, we will be working with both simple and complex variables consisting of PHP arrays that contain multiple values. Knowing that there can be multiple values, it is sometimes useful to dump the contents of the variable to know exactly what we are working with. The {{ dump() }} function allows us to view information about a template variable and is only available to us when Twig debugging is turned on. Let's take our name variable for instance and dump the contents to see what it contains.

Open page.html.twig and add the following to the bottom of the template:

{# Dumping variables #} {{ dump(name) }} 

If we save our template and refresh the browser, we will now see the name variable being dumped to ...