nested functions in php throws an exception when the outer is called more than once

Question

lest assume that i have the following

function a(){
  function b(){}
}
a(); //pass
a(); //error

why in the second call an exception is thr

Answer 1

It's because you're calling a() in a global scope. Add a function_exists call to make the above code work, but really there are few scenarios where you should really do something like this.