What is the difference between using "echo" and "return" in PHP functions?

When using a PHP function, the main difference between using "echo" and "return" is that "echo" is used to output data to the screen, while "return" is used to send a value back to the calling code. If you want to display something directly to the screen within a function, you would use "echo". On the other hand, if you want to return a value from the function to be used elsewhere in the code, you would use "return".

// Example using "echo"
function displayMessage() {
    echo "Hello, World!";
}

displayMessage(); // Output: Hello, World!


// Example using "return"
function getSum($num1, $num2) {
    $sum = $num1 + $num2;
    return $sum;
}

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