Improvement adding Type declarations to files

[gnovaro]

declare(strict_types=1); In December 2015, PHP 7 introduced scalar type declarations and with it the strict types flag. To enable the strict mode, a single declare directive must be placed at the top of the file. This means that the strictness of typing for scalars is configured on a per-file basis

https://www.php.net/manual/en/language.types.declarations.php#language.types.declarations.strict

[develart-projects]

I can't see any benefit of strict types in the PHP. Still enjoying the "free" nature of the loose-type.
In reality, one colleague of mine started using this in the sub-project, causing shitload of unnecessary problems in the process. I'll need to remove that in the future.