holy shit php sucks and is written by idiots

https://bugs.php.net/bug.php?id=54547

Please have a look at the comments by abakobob and myself ("nikic@php.net"). They explain why such behavior is actually good, in most cases.

If you wonder how to end execution of a function (as I did), it's that simple: return

function foo($a) {
 if(!$a) return;
 echo 'true';
 // some other code
}

foo(true) will echo 'true', foo(false) won't echo anything (as return ends execution of the function. Of course, therefore there is no need for 'else' before 'echo').