3.1. Superglobal Arrays

PHP offers several types of superglobal arrays to developers, each with a different useful purpose. A superglobal array (refer back to Chapter 2 for more information on arrays) is a special variable that are always available in scripts, regardless of the current scope of the script (see the Variable Scope section later in this chapter). PHP includes several superglobals:

  • $GLOBALS: Variables available in the global scope

  • $_SERVER: Information about the server

  • $_GET: Data passed using the HTTP GET method

  • $_POST: Data passed using the HTTP POST method

  • $_REQUEST: Data passed via an HTTP request

  • $_FILES: Data passed by an HTML file input

  • $_SESSION: Current session data specific to the user

  • $_COOKIE: Data stored on the user's browser ...

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