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PHP Superglobals
Superglobals are built-in variables that are always available in all scopes
Some predefined variables in PHP are "superglobals", which means they are available in all script.
There is no need to do global $variable; to access them within functions.
In PHP list of superglobal variables are given below.
$GLOBALS
$_SERVER
$_REQUEST
$_GET
$_POST
$_FILES
$_COOKIE
$_SESSION
$_ENV
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