string(1) "a"
string(1) "b"

string(3) "foo"
array(4) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
}

string(1) "a"
string(1) "b"

string(3) "foo"
array(4) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
}

C2::__call
bool(true)
string(1) "a"
string(1) "b"

C2::__call
bool(true)
string(3) "foo"
array(4) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
}

C2::__call
bool(true)
string(1) "a"
string(1) "b"

C2::__call
bool(true)
string(3) "foo"
array(4) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
}

C2::__call
bool(true)
string(1) "a"
string(1) "b"

C2::__call
bool(true)
string(3) "foo"
array(4) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
}

C2::__call
bool(true)
string(1) "a"
string(1) "b"

C2::__call
bool(true)
string(3) "foo"
array(4) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
}

C2::__call
bool(true)
string(1) "a"
string(1) "b"

C2::__call
bool(true)
string(3) "foo"
array(4) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
}

string(1) "a"
string(1) "b"

string(3) "foo"
array(4) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
}

string(1) "a"
string(1) "b"

string(3) "foo"
array(4) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
}

A4::foo
A4::foo
string(3) "foo"
array(0) {
}
string(3) "foo"
array(0) {
}