What is the potential issue with using global variables like $GLOBALS in PHP functions, as discussed in the forum thread?

Using global variables like $GLOBALS in PHP functions can lead to code that is harder to maintain and debug. It can make functions less reusable and more tightly coupled to the global state of the application. To solve this issue, it's better to pass variables as parameters to functions or use object-oriented programming techniques like classes and properties.

// Using parameters to pass variables to functions instead of using $GLOBALS
function calculateSum($num1, $num2) {
    return $num1 + $num2;
}

$num1 = 5;
$num2 = 10;
echo calculateSum($num1, $num2);