What's the difference between `return;` and no return?

Question

Is there a difference between:

function someMethod( $someArg ) {   // some code   return; } 

and

function someMethod( $someArg ) {   // some code   // no return } 

Both have NULL as 'return value'. Is there a difference? Something PHP internally? Performance? Speed?

edit
I ask, because in Zend framework (in this video) they use return; which seemed (seems) silly to me. However, you would think that the people behind Zend framework do know their PHP...

Answer 1

php code

<?php  function a() {    echo 1;    return; }  function b() {    echo 2; } 

generated bytecode

.FUNCTION a         ECHO                     1         RETURN                   NULL         RETURN                   NULL         HANDLE_EXCEPTION          .END FUNCTION  .FUNCTION b         ECHO                     2         RETURN                   NULL         HANDLE_EXCEPTION          .END FUNCTION 

so the explicit return statement generates one extra RETURN instruction. Otherwise there's no difference.