$_FILES пуст после отправки ⇐ Php

[Гость]

I'm doing a little project where the user can upload multiple images from a simple form.
When I submit the form I go in a service page where I must save the images, but this not working.
So, I tried to print

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$_FILES

, and I saw that it's empty. Where is the mistake?
This is the HTML code with Bootstrap:

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Carica

In the service page, I have a simple

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print_r($_FILES)

.
Someone can helps me? Thank you so much


Источник: https://stackoverflow.com/questions/781 ... ter-submit