Description:
------------
Introducing a parameter with a default value in a function of a derived class, where the function in the parent does not have a default value, throws an E_STRICT.

Introducing a default does NOT change the function's signature and should not cause any problems. It is possible in C++ and most other OO languages without any issues. In PHP it causes an E_STRICT to be thrown.

This is especially an issue when working with third party libraries (i.e. Smarty) that need to be overridden to have defaults (i.e. display()/fetch()). This works fine, but does throw an E_STRICT.

Reproduce code:
---------------
class Parent
{
  public function foo($bar)
  {
  }
}

class Child extends Parent
{
  public function foo($bar = "test")
  {
  }
}

Expected result:
----------------
No E_STRICT thrown

Actual result:
--------------
E_STRICT thrown