---- Pass uninitialized array & object by ref: function call ---
array(1) {
  [0]=>
  string(12) "Ref1 changed"
}
array(1) {
  [0]=>
  array(1) {
    [1]=>
    string(12) "Ref2 changed"
  }
}

 ---- Pass uninitialized arrays & objects by ref: static method call ---
array(1) {
  [0]=>
  string(12) "Ref1 changed"
}
array(1) {
  [0]=>
  array(1) {
    [1]=>
    string(12) "Ref2 changed"
  }
}


---- Pass uninitialized arrays & objects by ref: constructor ---
array(1) {
  [0]=>
  string(12) "Ref1 changed"
}
array(1) {
  [0]=>
  array(1) {
    [1]=>
    string(12) "Ref2 changed"
  }
}

 ---- Pass uninitialized arrays & objects by ref: instance method call ---
array(1) {
  [0]=>
  string(12) "Ref1 changed"
}
array(1) {
  [0]=>
  array(1) {
    [1]=>
    string(12) "Ref2 changed"
  }
}