$_FILES | Single file upload using move_uploaded_file | Server side extension validation(#4.2)

move_uploaded_file function
move_uploaded_file ( string $filename , string $destination ) : bool

This function checks to ensure that the file designated by filename is a valid upload file (meaning that it was uploaded via PHP's HTTP POST upload mechanism). If the file is valid, it will be moved to the filename given by destination.

This sort of check is especially important if there is any chance that anything done with uploaded files could reveal their contents to the user, or even to other users on the same system.

_FILE
An associative array of items uploaded to the current script via the HTTP POST method. The structure of this array is outlined in the POST method uploads section.
These superglobal variables are:

$GLOBALS
$_SERVER
$_GET
$_POST
$_FILES
$_COOKIE
$_SESSION
$_REQUEST
$_ENV

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