Several predefined variables in PHP are “superglobals”, which means that they are always accessible, regardless of scope – and you can access them from any function, class or file without having to do anything special.

The PHP superglobal variables are:

  • $_SERVER
  • $_POST
  • $_GET
  • $_FILES
  • $_ENV
  • $_COOKIE

$_SESSION superglobals does not necessarily contain data from the client

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