Simple variables:
int(123)
string(3) "foo"
string(3) "foo"
string(3) "foo"

Arrays:
array(2) {
  ["foo"]=>
  int(123)
  ["bar"]=>
  string(3) "foo"
}
id(foo)
id(foo)
id(bar)
array(2) {
  ["foo"]=>
  int(123)
  ["bar"]=>
  string(3) "foo"
}

Objects:
object(stdClass)#1 (2) {
  ["foo"]=>
  int(123)
  ["bar"]=>
  string(3) "foo"
}
id(foo)
id(foo)
id(bar)
object(stdClass)#2 (2) {
  ["foo"]=>
  int(123)
  ["bar"]=>
  string(3) "foo"
}

Static props:
int(123)
string(3) "foo"
id(foo)
id(foo)
id(bar)
int(123)
string(3) "foo"