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
global $myGlobalVariable; // Noncompliant
$GLOBALS['myGlobalVariable']; // Noncompliant