1.2.548. Implicit Global

Global variables, that are used in local scope with global keyword, but are not declared as global in the global scope. They may be mistaken with distinct values, while, in PHP, variables in the global scope are truly global.

<?php

// This is implicitely global
$implicitGlobal = 1;

global $explicitGlobal;
$explicitGlobal = 2;

foo();
echo $explicitFunctionGlobal;

function foo() {
    // This global is needed, but not the one in the global space
    global $implicitGlobal, $explicitGlobal, $explicitFunctionGlobal;

    // This won't be a global, as it must be 'global' in a function scope
    $notImplicitGlobal = 3;
    $explicitFunctionGlobal = 3;
}

?>

1.2.548.1. Specs

Short name	Structures/ImplicitGlobal
Rulesets	All
Exakat since	0.8.4
PHP Version	All
Severity	Minor
Time To Fix	Quick (30 mins)
Precision	Very high
Features	global
Available in	Entreprise Edition, Exakat Cloud