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My PHP functions cannot reference global PHP variables

ExpressionEngine returns the following error: "My PHP functions cannot reference global PHP variables."

Troubleshooting

PHP used within a template is always processed by the PHP function eval(). This means that all variables in your PHP code are of local scope, and your functions will not be able to reference them unless they are explicitly declared as globals.

Incorrect implementation:

<?php



$foo = 'Hello World!';



bar();

function bar() {

        global $foo;

        echo $foo;

}

?>

Correct implementation:

<?php



global $foo;

$foo = 'Hello World!';



bar();

function bar() {

        global $foo;

        echo $foo;

}

?>