What is the return type of a function that doesn't return anything?

In PHP, a function that doesn't explicitly return anything using the return statement will implicitly return null. This means that the return type of such a function is mixed, which can be either a specific data type or null.

Here's an example:

function myFunction() {
    echo "Hello, world!";
}

$result = myFunction();
var_dump($result); // Output: NULL

In this case, the myFunction() doesn't have a return statement, so it implicitly returns null. When you assign the result of myFunction() to the $result variable and use var_dump() to inspect its v...