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run code in 150+ php & hhvm versions
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<?php class parentobj implements Serializable { protected $data; private $extradata; public function __construct() { $this->data = new temp("My private data"); } public function getData() { return $this->data; } public function setData($data) { $this->data = $data; } public function getExtraData(){ $this->extradata = array( 'data1','data2' ); } public function serialize() { return serialize(array( $this->data, $this->extradata, )); } public function unserialize($data) { $orgdata = unserialize($data); $this->data = $orgdata[0]; $this->extradata = $orgdata[1]; } } class childobj extends parentobj { protected $moredata; public function __construct() { return parent::__construct(); } public function getMoreData(){ $this->moredata= array( 'more_data1','more_data2' ); } public function serialize() { return serialize(array( $this->data, $this->moredata, parent::serialize(), )); } public function unserialize($data) { $orgdata = unserialize($data); $this->setData($orgdata[0]); $this->extradata = $orgdata[1]; $this->moredata = $orgdata[2]; parent::unserialize($orgdata[3]); } } class temp { protected $name; public function __construct($Name) { $this->name = $Name; } } $obj = new childobj(); $s = serialize($obj); echo 'first serialize: '; var_dump($s); $u = unserialize($s); echo 'first unserialize: '; var_dump($u); $u->getExtraData(); $u->getMoreData(); echo 'with extradata: '; var_dump($u); $s2 = serialize($u); echo 'second serialize: '; var_dump($s2); $u2 = unserialize($s2); echo 'second unserialize: '; var_dump($u2);
based on dpsIr
Output for 5.4.0 - 5.6.28, 7.0.3 - 7.1.0
first serialize: string(121) "C:8:"childobj":100:{a:3:{i:0;r:3;i:1;N;i:2;s:68:"a:2:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;}";}}" Notice: unserialize(): Error at offset 13 of 100 bytes in /in/cCdm0 on line 63 first unserialize: object(childobj)#3 (4) { ["moredata":protected]=> NULL ["data":protected]=> NULL ["extradata":"parentobj":private]=> NULL ["extradata"]=> NULL } with extradata: object(childobj)#3 (4) { ["moredata":protected]=> array(2) { [0]=> string(10) "more_data1" [1]=> string(10) "more_data2" } ["data":protected]=> NULL ["extradata":"parentobj":private]=> array(2) { [0]=> string(5) "data1" [1]=> string(5) "data2" } ["extradata"]=> NULL } second serialize: string(153) "C:8:"childobj":132:{a:3:{i:0;N;i:1;a:2:{i:0;s:10:"more_data1";i:1;s:10:"more_data2";}i:2;s:54:"a:2:{i:0;N;i:1;a:2:{i:0;s:5:"data1";i:1;s:5:"data2";}}";}}" Notice: Undefined offset: 3 in /in/cCdm0 on line 68 second unserialize: object(childobj)#4 (4) { ["moredata":protected]=> string(54) "a:2:{i:0;N;i:1;a:2:{i:0;s:5:"data1";i:1;s:5:"data2";}}" ["data":protected]=> NULL ["extradata":"parentobj":private]=> NULL ["extradata"]=> array(2) { [0]=> string(10) "more_data1" [1]=> string(10) "more_data2" } }
Output for 7.0.0 - 7.0.2
first serialize: string(121) "C:8:"childobj":100:{a:3:{i:0;r:3;i:1;N;i:2;s:68:"a:2:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;}";}}" Notice: Undefined offset: 0 in /in/cCdm0 on line 64 Notice: Undefined offset: 3 in /in/cCdm0 on line 68 first unserialize: object(childobj)#3 (4) { ["moredata":protected]=> string(68) "a:2:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;}" ["data":protected]=> NULL ["extradata":"parentobj":private]=> NULL ["extradata"]=> NULL } with extradata: object(childobj)#3 (4) { ["moredata":protected]=> array(2) { [0]=> string(10) "more_data1" [1]=> string(10) "more_data2" } ["data":protected]=> NULL ["extradata":"parentobj":private]=> array(2) { [0]=> string(5) "data1" [1]=> string(5) "data2" } ["extradata"]=> NULL } second serialize: string(153) "C:8:"childobj":132:{a:3:{i:0;N;i:1;a:2:{i:0;s:10:"more_data1";i:1;s:10:"more_data2";}i:2;s:54:"a:2:{i:0;N;i:1;a:2:{i:0;s:5:"data1";i:1;s:5:"data2";}}";}}" Notice: Undefined offset: 3 in /in/cCdm0 on line 68 second unserialize: object(childobj)#4 (4) { ["moredata":protected]=> string(54) "a:2:{i:0;N;i:1;a:2:{i:0;s:5:"data1";i:1;s:5:"data2";}}" ["data":protected]=> NULL ["extradata":"parentobj":private]=> NULL ["extradata"]=> array(2) { [0]=> string(10) "more_data1" [1]=> string(10) "more_data2" } }
Output for hhvm-3.12.0
first serialize: string(169) "C:8:"childobj":148:{a:3:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;i:2;s:68:"a:2:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;}";}}" Notice: Undefined index: 3 in /in/cCdm0 on line 68 first unserialize: object(childobj)#3 (4) { ["moredata":protected]=> string(68) "a:2:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;}" ["data":protected]=> NULL ["extradata":"parentobj":private]=> NULL ["extradata"]=> NULL } with extradata: object(childobj)#3 (4) { ["moredata":protected]=> array(2) { [0]=> string(10) "more_data1" [1]=> string(10) "more_data2" } ["data":protected]=> NULL ["extradata":"parentobj":private]=> array(2) { [0]=> string(5) "data1" [1]=> string(5) "data2" } ["extradata"]=> NULL } second serialize: string(153) "C:8:"childobj":132:{a:3:{i:0;N;i:1;a:2:{i:0;s:10:"more_data1";i:1;s:10:"more_data2";}i:2;s:54:"a:2:{i:0;N;i:1;a:2:{i:0;s:5:"data1";i:1;s:5:"data2";}}";}}" Notice: Undefined index: 3 in /in/cCdm0 on line 68 second unserialize: object(childobj)#4 (4) { ["moredata":protected]=> string(54) "a:2:{i:0;N;i:1;a:2:{i:0;s:5:"data1";i:1;s:5:"data2";}}" ["data":protected]=> NULL ["extradata":"parentobj":private]=> NULL ["extradata"]=> array(2) { [0]=> string(10) "more_data1" [1]=> string(10) "more_data2" } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
first serialize: string(169) "C:8:"childobj":148:{a:3:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;i:2;s:68:"a:2:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;}";}}" Notice: Undefined offset: 3 in /in/cCdm0 on line 68 first unserialize: object(childobj)#3 (4) { ["moredata":protected]=> string(68) "a:2:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;}" ["data":protected]=> NULL ["extradata":"parentobj":private]=> NULL ["extradata"]=> NULL } with extradata: object(childobj)#3 (4) { ["moredata":protected]=> array(2) { [0]=> string(10) "more_data1" [1]=> string(10) "more_data2" } ["data":protected]=> NULL ["extradata":"parentobj":private]=> array(2) { [0]=> string(5) "data1" [1]=> string(5) "data2" } ["extradata"]=> NULL } second serialize: string(153) "C:8:"childobj":132:{a:3:{i:0;N;i:1;a:2:{i:0;s:10:"more_data1";i:1;s:10:"more_data2";}i:2;s:54:"a:2:{i:0;N;i:1;a:2:{i:0;s:5:"data1";i:1;s:5:"data2";}}";}}" Notice: Undefined offset: 3 in /in/cCdm0 on line 68 second unserialize: object(childobj)#4 (4) { ["moredata":protected]=> string(54) "a:2:{i:0;N;i:1;a:2:{i:0;s:5:"data1";i:1;s:5:"data2";}}" ["data":protected]=> NULL ["extradata":"parentobj":private]=> NULL ["extradata"]=> array(2) { [0]=> string(10) "more_data1" [1]=> string(10) "more_data2" } }
Output for 5.2.0 - 5.2.17
first serialize: string(169) "C:8:"childobj":148:{a:3:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;i:2;s:68:"a:2:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;}";}}" Notice: Undefined offset: 3 in /in/cCdm0 on line 68 first unserialize: object(childobj)#3 (4) { ["moredata:protected"]=> string(68) "a:2:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;}" ["data:protected"]=> NULL ["extradata:private"]=> NULL ["extradata"]=> NULL } with extradata: object(childobj)#3 (4) { ["moredata:protected"]=> array(2) { [0]=> string(10) "more_data1" [1]=> string(10) "more_data2" } ["data:protected"]=> NULL ["extradata:private"]=> array(2) { [0]=> string(5) "data1" [1]=> string(5) "data2" } ["extradata"]=> NULL } second serialize: string(153) "C:8:"childobj":132:{a:3:{i:0;N;i:1;a:2:{i:0;s:10:"more_data1";i:1;s:10:"more_data2";}i:2;s:54:"a:2:{i:0;N;i:1;a:2:{i:0;s:5:"data1";i:1;s:5:"data2";}}";}}" Notice: Undefined offset: 3 in /in/cCdm0 on line 68 second unserialize: object(childobj)#4 (4) { ["moredata:protected"]=> string(54) "a:2:{i:0;N;i:1;a:2:{i:0;s:5:"data1";i:1;s:5:"data2";}}" ["data:protected"]=> NULL ["extradata:private"]=> NULL ["extradata"]=> array(2) { [0]=> string(10) "more_data1" [1]=> string(10) "more_data2" } }
Output for 5.1.0 - 5.1.6
first serialize: string(169) "C:8:"childobj":148:{a:3:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;i:2;s:68:"a:2:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;}";}}" Notice: Undefined offset: 3 in /in/cCdm0 on line 68 Notice: unserialize(): Argument is not a string in /in/cCdm0 on line 32 first unserialize: object(childobj)#3 (4) { ["moredata:protected"]=> string(68) "a:2:{i:0;O:4:"temp":1:{s:7:"*name";s:15:"My private data";}i:1;N;}" ["data:protected"]=> NULL ["extradata:private"]=> NULL ["extradata"]=> NULL } with extradata: object(childobj)#3 (4) { ["moredata:protected"]=> array(2) { [0]=> string(10) "more_data1" [1]=> string(10) "more_data2" } ["data:protected"]=> NULL ["extradata:private"]=> array(2) { [0]=> string(5) "data1" [1]=> string(5) "data2" } ["extradata"]=> NULL } second serialize: string(153) "C:8:"childobj":132:{a:3:{i:0;N;i:1;a:2:{i:0;s:10:"more_data1";i:1;s:10:"more_data2";}i:2;s:54:"a:2:{i:0;N;i:1;a:2:{i:0;s:5:"data1";i:1;s:5:"data2";}}";}}" Notice: Undefined offset: 3 in /in/cCdm0 on line 68 Notice: unserialize(): Argument is not a string in /in/cCdm0 on line 32 second unserialize: object(childobj)#4 (4) { ["moredata:protected"]=> string(54) "a:2:{i:0;N;i:1;a:2:{i:0;s:5:"data1";i:1;s:5:"data2";}}" ["data:protected"]=> NULL ["extradata:private"]=> NULL ["extradata"]=> array(2) { [0]=> string(10) "more_data1" [1]=> string(10) "more_data2" } }
Output for 5.0.5
Fatal error: Interface 'Serializable' not found in /in/cCdm0 on line 2
Process exited with code 255.
Output for 5.0.0 - 5.0.4
Fatal error: Class 'Serializable' not found in /in/cCdm0 on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/cCdm0 on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting '{' in /in/cCdm0 on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/cCdm0 on line 2
Process exited with code 255.