What are the common pitfalls when using global variables in PHP?

Common pitfalls when using global variables in PHP include potential naming conflicts, difficulty in tracking variable changes, and decreased code readability. To avoid these issues, it's recommended to limit the use of global variables and instead use function parameters or return values to pass data between functions. 

// Avoid using global variables
function addNumbers($num1, $num2) {
    return $num1 + $num2;
}

$result = addNumbers(5, 3);
echo $result;

Keywords

global variables scope variable contamination security vulnerabilities namespace pollution

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