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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('A', '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())); var_dump((array) new C());
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: C implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /in/Mjpp4 on line 16 string(33) "O:1:"A":1:{s:4:"Ab";s:3:"foo";}" Warning: serialize(): "b" returned as member variable from __sleep() but does not exist in /in/Mjpp4 on line 28 string(12) "O:1:"B":0:{}" string(37) "C:1:"C":24:{a:1:{s:1:"b";s:3:"foo";}}" array(1) { ["Ab"]=> string(3) "foo" }
Output for 8.0.0 - 8.0.30
string(33) "O:1:"A":1:{s:4:"Ab";s:3:"foo";}" Warning: serialize(): "b" returned as member variable from __sleep() but does not exist in /in/Mjpp4 on line 28 string(12) "O:1:"B":0:{}" string(37) "C:1:"C":24:{a:1:{s:1:"b";s:3:"foo";}}" array(1) { ["Ab"]=> string(3) "foo" }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
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/Mjpp4 on line 28 string(22) "O:1:"B":1:{s:1:"b";N;}" string(37) "C:1:"C":24:{a:1:{s:1:"b";s:3:"foo";}}" array(1) { ["Ab"]=> string(3) "foo" }
Output for 7.3.32 - 7.3.33, 7.4.26
string(33) "O:1:"A":1:{s:4:"Ab";s:3:"foo";}" string(22) "O:1:"B":1:{s:1:"b";N;}" string(37) "C:1:"C":24:{a:1:{s:1:"b";s:3:"foo";}}" array(1) { ["Ab"]=> string(3) "foo" }
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
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/Mjpp4 on line 28 string(22) "O:1:"B":1:{s:1:"b";N;}" Fatal error: Call to undefined method ReflectionProperty::setAccessible() in /in/Mjpp4 on line 22
Process exited with code 255.
Output for 5.0.5
Fatal error: Interface 'Serializable' not found in /in/Mjpp4 on line 16
Process exited with code 255.
Output for 5.0.0 - 5.0.4
Fatal error: Class 'Serializable' not found in /in/Mjpp4 on line 16
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/Mjpp4 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/Mjpp4 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/Mjpp4 on line 5
Process exited with code 255.

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