## Why is this an issue?

Global variables are a useful construct, but they should not be abused. Functions can access the global scope either through the `global` keyword or though the `$GLOBALS` array, but these practices considerably reduce the function’s readability and reusability. Instead, the global variable should be passed as a parameter to the function.

### Noncompliant code example

    $myGlobalVariable;

    function foo()
    {
      global $myGlobalVariable; // Noncompliant
      $GLOBALS['myGlobalVariable']; // Noncompliant
      // ...
    }

### Compliant solution

    function foo($myStateVariable)
    {
      // ...
    }