How to use FILES file size

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How can I see if the file loaded weighs less than 5MB? I am using:

$ _FILES ["file"] ["size"] 

However, I have no idea how to set 5MB because, as far as I can tell, the value must be given in bytes. So what should I do?

$ _FILES ["file"] ["size"] <(5mb)
Jul 25 in PHP by Kithuzzz
• 3,660 points
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