How can functions in PHP be structured to effectively pass and utilize variables?

To effectively pass and utilize variables in PHP functions, you can define parameters in the function declaration and pass arguments when calling the function. Inside the function, you can then work with these variables to perform operations or return values as needed. 

function calculateSum($num1, $num2) {
    $sum = $num1 + $num2;
    return $sum;
}

$result = calculateSum(5, 3);
echo $result; // Output: 8

Keywords

PHP functions variables pass by reference return values scope

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