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<?php class Foo { public $bar='bar'; private $baz='baz'; } $foo = new Foo; unset($foo->$bar); var_dump($foo);
based on vsdHW
Output for 7.1.0
Notice: Undefined variable: bar in /in/eNI8I on line 7 object(Foo)#1 (2) { ["bar"]=> string(3) "bar" ["baz":"Foo":private]=> string(3) "baz" }
Output for 7.0.0 - 7.0.14
Notice: Undefined variable: bar in /in/eNI8I on line 7 Fatal error: Uncaught Error: Cannot access empty property in /in/eNI8I:7 Stack trace: #0 {main} thrown in /in/eNI8I on line 7
Process exited with code 255.
Output for hhvm-3.12.0
Fatal error: Cannot access empty property in /in/eNI8I on line 7
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.5 - 5.6.28
Notice: Undefined variable: bar in /in/eNI8I on line 7 Fatal error: Cannot access empty property in /in/eNI8I on line 7
Process exited with code 255.
Output for 5.0.4
Notice: Undefined variable: bar in /in/eNI8I on line 7 object(Foo)#1 (2) { ["bar"]=> string(3) "bar" ["baz:private"]=> string(3) "baz" }
Output for 5.0.0 - 5.0.3
Notice: Undefined variable: bar in /in/eNI8I on line 7 object(Foo)#1 (2) { ["bar"]=> string(3) "bar" ["baz:private"]=> string(3) "baz" }
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/eNI8I on line 3
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 T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/eNI8I on line 3
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/eNI8I on line 3
Process exited with code 255.