I am starting a new project in symfony and i have switched from PHP56 to PHP7. As per guidelines you have to add following to reflect new features of PHP7

<?php 

declare(strict_types=1);

// Rest of the code...

Where should i put 'strict_type' in my new symfony project to avoid writing 'strict_type' in each file, so that new features of PHP7 should be reflected globally throughout the project?