How to use $_FILES["file"]["size"]?

To keep code clear, I often define units as constants:

define('KB', 1024);
define('MB', 1048576);
define('GB', 1073741824);
define('TB', 1099511627776);

Then you can simply do your condition like

if ($_FILES['file']['size'] < 5*MB)

5MB -> 5 * 1024 * 1024 bytes

or... if you're a storage vendor, then it's actually 5 * 1000 * 1000.

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