Problem
You want to assign a variable in a Blade template.
Solution
Blade does not provide a command to do this.
The idea is to cleanly separate logic from presentation. But in the case where it's more expedient to assign a variable in a template, here's a couple tricks.
You can always use the PHP tags.
$var
Or, you can use a Blade comment with a special syntax.
--*/ $var = 'test' /*--$var
This second method works because Blade comments get translated in the format below.
Thus, the above variable assignment gets translated to the following PHP code.
See Using Comments in Blade Templates.
Discussion
You also extend Blade adding a new command, such as @setvar.
See the Extending Blade Templates recipe.