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<?php class A { private $b = 'foo'; } class B extends A { public function __sleep() { return array('b'); } } class C extends A implements Serializable { public function unserialize($serialized) { /*... */ } public function serialize() { $b = new ReflectionProperty('C', 'b'); $b->setAccessible(true); return serialize(array('b' => $b->getValue($this))); } } var_dump(serialize(new A())); var_dump(serialize(new B())); var_dump(serialize(new C()));
Output for 7.0.0 - 7.1.0
string(33) "O:1:"A":1:{s:4:"Ab";s:3:"foo";}" Notice: serialize(): "b" returned as member variable from __sleep() but does not exist in /in/7gmJ5 on line 28 string(22) "O:1:"B":1:{s:1:"b";N;}" Fatal error: Uncaught ReflectionException: Property C::$b does not exist in /in/7gmJ5:21 Stack trace: #0 /in/7gmJ5(21): ReflectionProperty->__construct('C', 'b') #1 [internal function]: C->serialize() #2 /in/7gmJ5(29): serialize(Object(C)) #3 {main} thrown in /in/7gmJ5 on line 21
Process exited with code 255.
Output for 5.5.0 - 5.6.28
string(33) "O:1:"A":1:{s:4:"Ab";s:3:"foo";}" Notice: serialize(): "b" returned as member variable from __sleep() but does not exist in /in/7gmJ5 on line 28 string(22) "O:1:"B":1:{s:1:"b";N;}" Fatal error: Uncaught exception 'ReflectionException' with message 'Property C::$b does not exist' in /in/7gmJ5:21 Stack trace: #0 /in/7gmJ5(21): ReflectionProperty->__construct('C', 'b') #1 [internal function]: C->serialize() #2 /in/7gmJ5(29): serialize(Object(C)) #3 {main} thrown in /in/7gmJ5 on line 21
Process exited with code 255.
Output for 5.2.3 - 5.2.17, 5.4.14 - 5.4.45
string(33) "O:1:"A":1:{s:4:"Ab";s:3:"foo";}" string(22) "O:1:"B":1:{s:1:"b";N;}" Fatal error: Uncaught exception 'ReflectionException' with message 'Property C::$b does not exist' in /in/7gmJ5:21 Stack trace: #0 /in/7gmJ5(21): ReflectionProperty->__construct('C', 'b') #1 [internal function]: C->serialize() #2 /in/7gmJ5(29): serialize(Object(C)) #3 {main} thrown in /in/7gmJ5 on line 21
Process exited with code 255.
Output for 5.3.3 - 5.4.13
string(33) "O:1:"A":1:{s:4:"Ab";s:3:"foo";}" string(22) "O:1:"B":1:{s:1:"b";N;}" Fatal error: Uncaught exception 'ReflectionException' with message 'Property C::$b does not exist' in /in/7gmJ5:21 Stack trace: #0 /in/7gmJ5(21): ReflectionProperty->__construct('C', 'b') #1 [internal function]: C->serialize() #2 /in/7gmJ5(29): serialize(Object(C)) #3 {main} Next exception 'Exception' with message 'C::serialize() must return a string or NULL' in /in/7gmJ5:29 Stack trace: #0 /in/7gmJ5(0): serialize() #1 {main} thrown in /in/7gmJ5 on line 29
Process exited with code 255.
Output for 5.3.0 - 5.3.2
string(33) "O:1:"A":1:{s:4:"Ab";s:3:"foo";}" string(22) "O:1:"B":1:{s:1:"b";N;}" Fatal error: Uncaught exception 'ReflectionException' with message 'Property C::$b does not exist' in /in/7gmJ5:21 Stack trace: #0 /in/7gmJ5(21): ReflectionProperty->__construct('C', 'b') #1 [internal function]: C->serialize() #2 /in/7gmJ5(29): serialize(Object(C)) #3 {main} Next exception 'Exception' with message 'C::serialize() must return a string or NULL' in /in/7gmJ5:0 Stack trace: #0 /in/7gmJ5(0): serialize() #1 {main} thrown in /in/7gmJ5 on line 0
Process exited with code 255.
Output for 5.1.3 - 5.2.2
string(33) "O:1:"A":1:{s:4:"Ab";s:3:"foo";}" string(22) "O:1:"B":1:{s:1:"b";N;}" <br /> <b>Fatal error</b>: Uncaught exception 'ReflectionException' with message 'Property C::$b does not exist' in /in/7gmJ5:21 Stack trace: #0 /in/7gmJ5(21): ReflectionProperty-&gt;__construct('C', 'b') #1 [internal function]: C-&gt;serialize() #2 /in/7gmJ5(29): serialize(Object(C)) #3 {main} thrown in <b>/in/7gmJ5</b> on line <b>21</b><br />
Process exited with code 255.
Output for 5.1.2
string(33) "O:1:"A":1:{s:4:"Ab";s:3:"foo";}" string(22) "O:1:"B":1:{s:1:"b";N;}" <br /> <b>Fatal error</b>: Uncaught exception 'ReflectionException' with message 'Property C::$b does not exist' in /in/7gmJ5:21 Stack trace: #0 /in/7gmJ5(21): ReflectionProperty-&gt;__construct('C', 'b') #1 [internal function]: C::serialize() #2 /in/7gmJ5(29): serialize(Object(C)) #3 {main} thrown in <b>/in/7gmJ5</b> on line <b>21</b><br />
Process exited with code 255.
Output for 5.1.0 - 5.1.1
string(33) "O:1:"A":1:{s:4:"Ab";s:3:"foo";}" string(22) "O:1:"B":1:{s:1:"b";N;}" <br /> <b>Fatal error</b>: Uncaught exception 'ReflectionException' with message 'Property C::$b does not exist' in /in/7gmJ5:21 Stack trace: #0 /in/7gmJ5(21): ReflectionProperty->__construct('C', 'b') #1 [internal function]: C::serialize() #2 /in/7gmJ5(29): serialize(Object(C)) #3 {main} thrown in <b>/in/7gmJ5</b> on line <b>21</b><br />
Process exited with code 255.
Output for 5.0.5
<br /> <b>Fatal error</b>: Interface 'Serializable' not found in <b>/in/7gmJ5</b> on line <b>16</b><br />
Process exited with code 255.
Output for 5.0.0 - 5.0.4
<br /> <b>Fatal error</b>: Class 'Serializable' not found in <b>/in/7gmJ5</b> on line <b>16</b><br />
Process exited with code 255.
Output for 4.4.2 - 4.4.9
<br /> <b>Parse error</b>: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in <b>/in/7gmJ5</b> on line <b>5</b><br />
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
<br /> <b>Parse error</b>: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in <b>/in/7gmJ5</b> on line <b>5</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.3.4
<br /> <b>Parse error</b>: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in <b>/in/7gmJ5</b> on line <b>5</b><br />
Process exited with code 255.