How to print out $_file

That is, it is a super-global array, supposedly should be in a PHP page can be printed out Ah, but I printed it is indeed an array (); Somehow,
So the question comes, $_file still have to have what conditions to print out?
Like the environment I was printing in.

Reply to discussion (solution)

Paste the form out

I use Print_r and var_dump to print not a few sets of structure to

Print_r ($_files); Cannot use echo output

Which page did you submit to and send yourand form Forms

Which page did you submit to and send yourand form Forms

In fact, my goal is to print out the structure of the $_file array,

No data submitted in the past is not printed out is an empty array of arrays

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