Is it good programming practice to have a return statement in all functions?

Question

I have a basic programming question. I would like to know if every non-void function should have an "return" statement in PHP script.

Take the following two example functions. Which one would be the better way to program? They both do the same thing (to my understanding) but which is the "better practice" and why?

function displayApple1($str){
    if($str == 'apple')
        echo $str;
}

function displayApple2($str){
    if($str == 'apple')
        echo $str;
    else
        return;
}

Answer 1

Overuse of return is a bad thing. Your execution paths should be simple and straightforward; overuse of the return keyword can imply (improper) complexity.