$_FILES -- $HTTP_POST_FILES [deprecated] — HTTP File Upload variables
An associative array of items uploaded to the current script
via the HTTP POST method.
$HTTP_POST_FILES contains the same initial
information, but is not a superglobal.
(Note that $HTTP_POST_FILES and $_FILES
are different variables and that PHP handles them as such)
Introduced $_FILES that deprecated
Note: This is a 'superglobal', or
automatic global, variable. This simply means that it is available in
all scopes throughout a script. There is no need to do
global $variable; to access it within functions or methods.