How to crop images?

Question

PHP

How to crop images? those. when adding pictures, you could select a specific piece

something like this

Answer 1

It has nothing to do with form. The picture can be styled without distorting proportions, but with cropping, depending on how you make it. You can use PHP and the appropriate libraries to crop as needed. front-end or back-end are not stages.
Thumbnails, such as photos, are often created on the server. And directly for the display, so that everything is beautiful at different resolutions - this is layout and possibly JS.