Get Template Variables

[Cohaven]

Is there any way to get template variables from the \phpbb\template\template $template? I know how to assign variables:

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$this->template->assign_vars(array(
                'USERNAME'   => $display_name,
                'L_CONTACT_USER' => "CONTACT $display_name",
                )
);

but I can't find a way to get the variables that were assigned. Something like:

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$username = $this->template->get_var('USERNAME');

[kasimi]

For phpBB 3.1.x and 3.2.0 you need to use the @template_context service:

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$username = $this->template_context->get_root_ref()['USERNAME'];

Since phpBB 3.2.1 you can use the @template:

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$username = $this->template->retrieve_var('USERNAME')