Description:
------------
Recursively calling two functions in a class leads to a segmentation fault.

Reproduce code:
---------------
class SegFault {

  public function call(){
    $this->back();
  }

  public function back(){
    $this->call();
  }
}
$seg = new SegFault();
$seg->Call();


Expected result:
----------------
I'd expect some kind of error when php runs out of buffer for the callstack - this function clearly is an example of bad code in the script - however php shouldnt die by segmentation fault.


Actual result:
--------------
Segmentation fault