Online PHP editor | output for u130I

<?php $x = 4; if($x == 1){ class X{} $x = []; $x["x"] = new X(); $x["y"] = "5"; echo serialize($x); // a:2:{s:1:"x";O:1:"X":0:{}s:1:"y";s:1:"5";} } elseif($x == 2){ $x = unserialize('a:2:{s:1:"x";O:1:"X":0:{}s:1:"y";s:1:"5";}'); print_r($x); /* Array ( [x] => __PHP_Incomplete_Class Object ( [__PHP_Incomplete_Class_Name] => X ) [y] => 5 ) */ } elseif($x == 3){ enum Y{ case Y; } $x = []; $x["x"] = Y::Y; $x["y"] = "5"; echo serialize($x); // a:2:{s:1:"x";E:3:"Y:Y";s:1:"y";s:1:"5";} } elseif($x == 4){ $x = unserialize('a:2:{s:1:"x";E:3:"Y:Y";s:1:"y";s:1:"5";}'); print_r($x); }