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run code in 150+ php & hhvm versions
Bugs & Features
<?php $list = new SplDoublyLinkedList; $list->push("foo"); $list->push("bar"); $ser = $list->serialize(); var_dump($ser); var_dump(unserialize($ser)); $list->setIteratorMode(SplDoublyLinkedList::IT_MODE_KEEP); $ser = $list->serialize(); var_dump($ser); var_dump(unserialize($ser));
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
string(26) "i:0;:s:3:"foo";:s:3:"bar";" int(0) string(26) "i:0;:s:3:"foo";:s:3:"bar";" int(0)
Output for hhvm-3.12.0
string(52) "a:2:{i:0;a:2:{i:0;s:3:"foo";i:1;s:3:"bar";}i:1;i:0;}" array(2) { [0]=> array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" } [1]=> int(0) } string(52) "a:2:{i:0;a:2:{i:0;s:3:"foo";i:1;s:3:"bar";}i:1;i:0;}" array(2) { [0]=> array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" } [1]=> int(0) }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
Fatal error: Call to undefined method SplDoublyLinkedList::serialize() in /in/Bcii2 on line 5
Process exited with code 255.
Output for 5.0.0 - 5.2.17
Fatal error: Class 'SplDoublyLinkedList' not found in /in/Bcii2 on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected ')', expecting '(' in /in/Bcii2 on line 8
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected ')', expecting '(' in /in/Bcii2 on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'('' in /in/Bcii2 on line 8
Process exited with code 255.