What are the main differences between using return within functions and using it outside of functions in PHP, and how can this impact the functionality of the code?

When using `return` within a function in PHP, it allows the function to return a value to the caller and immediately stop the function's execution. On the other hand, using `return` outside of a function is not valid syntax and will result in a parse error. To ensure proper functionality, always use `return` within functions to return values, and avoid using it outside of functions. 

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

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

Keywords

return functions PHP functionality code

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