Default value for return

A few days ago, i try to create a code with PHP, with a function i do a return in function with some values and then i got a mystery about default value for return keyword, to get absolutelly value with this keyword i create a function to test it, like this.

<?php
function defaultValueForReturn(){
   return;
}// now i test it

var_dump (defaultValueForReturn());  ?>

And this is result:

What about with other programming language such as Python, Javascript, etc.
Check this!



Python.
Code:

#!/usr/bin/env python
def defaultValueForReturn():
    return

type(defaultValueForReturn())

Result:

Javascript.
Code:

function returnValue() {
   return;
}

var y = returnValue();
console.log(typeof (y));

Result:
undefined


Ruby.
Code:

def defaultValueForReturn()
    return
end

y=defaultValueForReturn()
print y.class

Result:
NilClass

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