オブジェクトへの変換<br>
bool(true)
object(stdClass)#1 (1) {
  ["1"]=>
  string(3) "foo"
}
bool(true)
object(stdClass)#2 (1) {
  ["1"]=>
  string(3) "foo"
}
object(stdClass)#1 (1) {
  ["scalar"]=>
  string(4) "memo"
}
string(4) "memo"