Editing Global variable (section)

=== PHP ===
[[PHP]] has a <code>global</code> keyword and a number of unusual ways of using global variables.
Variables declared outside functions have file scope (which is for most purposes the widest scope). However, they are not accessible inside functions unless imported with the <code>global</code> keyword (i.e., the keyword ''accesses'' global variables, it does not ''declare'' them).

However, some predefined variables, known as ''superglobals'' are always accessible. 
They are all arrays. A general purpose one is the <code>$GLOBALS</code> superglobal, which contains all the variables
defined out of function scope. Changes to its elements change the original variables, and additions create new variables.
The superglobals <code>$_POST</code> and <code>$_GET</code> are widely used in web programming.