What are the potential security risks associated with using global variables in PHP scripts?

Using global variables in PHP scripts can pose security risks such as data leakage, unintended variable modification, and potential conflicts with other scripts. To mitigate these risks, it is recommended to avoid using global variables whenever possible and instead use proper variable scoping techniques such as passing variables as function parameters or using classes and objects to encapsulate data. 

// Avoid using global variables by passing variables as function parameters
function calculateTotal($price, $quantity) {
    $total = $price * $quantity;
    return $total;
}

$price = 10;
$quantity = 5;
$total = calculateTotal($price, $quantity);
echo "Total: $total";

Keywords

global variables security risks PHP scripts injection attacks data leakage

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