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<?php class testString { public $a = true; function __sleep() { return array('a', '1'); } } class testInteger { public $a = true; function __sleep() { return array('a', 1); } } $cs = new testString(); $ci = new testInteger(); $ss = @serialize($cs); echo $ss . "\n"; $si = @serialize($ci); echo $si . "\n"; var_dump(unserialize($ss)); var_dump(unserialize($si));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
O:10:"testString":1:{s:1:"a";b:1;} O:11:"testInteger":1:{s:1:"a";b:1;} object(testString)#3 (1) { ["a"]=> bool(true) } object(testInteger)#3 (1) { ["a"]=> bool(true) }
Output for 5.6.8 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
O:10:"testString":2:{s:1:"a";b:1;s:1:"1";N;} O:11:"testInteger":2:{s:1:"a";b:1;s:1:"1";N;} object(testString)#3 (2) { ["a"]=> bool(true) ["1"]=> NULL } object(testInteger)#3 (2) { ["a"]=> bool(true) ["1"]=> NULL }
Output for 5.0.3 - 5.0.4, 5.1.0 - 5.1.6, 5.2.0 - 5.2.5, 5.3.9 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.7
O:10:"testString":2:{s:1:"a";b:1;s:1:"1";N;} O:11:"testInteger":2:{s:1:"a";b:1;N;} object(testString)#3 (2) { ["a"]=> bool(true) ["1"]=> NULL } Notice: unserialize(): Error at offset 36 of 37 bytes in /in/8MsoA on line 33 bool(false)
Output for 5.2.6 - 5.2.17, 5.3.0 - 5.3.8
O:10:"testString":2:{s:1:"a";b:1;s:1:"1";N;} O:11:"testInteger":2:{s:1:"a";b:1;N;} object(testString)#3 (2) { ["a"]=> bool(true) [1]=> NULL } Notice: unserialize(): Error at offset 36 of 37 bytes in /in/8MsoA on line 33 bool(false)
Output for 5.0.5

Process exited with code 139.
Output for 5.0.0 - 5.0.2
O:10:"testString":2:{s:1:"a";b:1;s:1:"1";N;} O:11:"testInteger":2:{s:1:"a";b:1;N;} object(testString)#3 (2) { ["a"]=> bool(true) ["1"]=> NULL } Notice: unserialize(): Unexpected end of serialized data in /in/8MsoA on line 33 Notice: unserialize(): Error at offset 36 of 37 bytes in /in/8MsoA on line 33 bool(false)
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/8MsoA 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/8MsoA 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/8MsoA on line 5
Process exited with code 255.
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