Static properties:
array(1) {
  ["key"]=>
  string(5) "value"
}
array(1) {
  ["key"]=>
  string(5) "value"
}
array(1) {
  ["key"]=>
  string(5) "value"
}
array(1) {
  ["key"]=>
  string(5) "value"
}
array(1) {
  ["key"]=>
  string(5) "value"
}

Instance properties:
object(X)#1 (1) {
  ["a_x"]=>
  array(1) {
    ["key"]=>
    string(5) "value"
  }
}
object(B)#2 (1) {
  ["a_b"]=>
  array(1) {
    ["key"]=>
    string(5) "value"
  }
}
object(C)#3 (3) {
  ["a_c_parent"]=>
  array(1) {
    ["key"]=>
    string(5) "value"
  }
  ["a_c_self"]=>
  array(1) {
    ["key"]=>
    string(5) "value"
  }
  ["a_b"]=>
  array(1) {
    ["key"]=>
    string(5) "value"
  }
}