$_get and $_post in php
# $_ Variables are referred to as Superglobals
$GLOBALS # Global Variables, think _G in lua
$_SERVER # Miscellanous information, such as argv and argc!
$_GET # Get URL Parameters
$_POST # Variables passed via the POST method
$_FILES # Files uploaded to the script
$_COOKIE # HTTP Cookies
$_SESSION # Session Variables
$_REQUEST # Contains request info like $_GET, $_POST and $_COOKIE
$_ENV # Environment variables, just as youd expect