[simonhamp]

A lot of what Hack introduced to the PHP community has become available in suitably forward-thinking ways to allow for a sensible amount of backwards compatibility and are opt-in.

For example, you can set strict typing on a per-file basis.

`declare(strict_types=1);`

I believe that the performance difference between the two is negligible now too. So it really just comes down to personal preference/platform legacy.

But Hack is on a different path which is potentially going to make it harder to share code between PHP and Hack.

PHP still has by far the larger community.

Given the choice today, I’d run with PHP.

[asddubs]

the only thing that sucks about strict typing is that there's no way to toggle it globally. so if you want to transition a codebase that's simultaneously actively being developed in other ways, you have to mess around with scripts that append it to the start of all php files/remove it again

[nawarian]

Nothing that tools like Rector can't help you with.

I believe this extra step is incredibly important, given most of your dependencies you won't control and forcing strict types to them is not very clever IMO.

[asddubs]

I guess it wouldn't work if your dependencies weren't easily seperable from the rest of the code. in this case there are no dependencies, it's all custom cobbled together, for better or worse