How can the use of return statements in PHP functions help maintain data integrity and prevent variable destruction?

Using return statements in PHP functions helps maintain data integrity by explicitly defining what value should be returned by the function. This prevents accidental variable destruction or unintended data manipulation. By returning values instead of relying on global variables, the function becomes more self-contained and predictable. 

function calculateTotal($price, $quantity) {
    $total = $price * $quantity;
    return $total;
}

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

Keywords

return statements PHP functions data integrity variable destruction error prevention

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