What are the differences between using "return" versus "echo" or "print" in PHP functions?

When writing PHP functions, it is important to understand the difference between using "return" versus "echo" or "print". The key distinction is that "return" is used to return a value from a function, which can then be assigned to a variable or used in further calculations. On the other hand, "echo" and "print" are used to output data directly to the browser or console. Therefore, if you want to manipulate or store the result of a function, you should use "return", whereas if you simply want to display the result, "echo" or "print" would be more appropriate.

// Using "return" to return a value from a function
function addNumbers($num1, $num2) {
    $sum = $num1 + $num2;
    return $sum;
}

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

// Using "echo" to directly output data from a function
function greetUser($name) {
    echo "Hello, " . $name . "!";
}

greetUser("John"); // Output: Hello, John!