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run code in 150+ php & hhvm versions
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<?php class Fooer { private $bar; public function cleanBar() { unset($this->bar); } public function doThings() { if ($this->bar) { return 'things'; } return 'no things!'; } } $foo = new Fooer(); $foo->cleanBar(); var_dump($foo->doThings());
Output for 5.2.6 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined property: Fooer::$bar in /in/pt77Z on line 8 string(10) "no things!"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.5
Notice: Undefined property: Fooer::$bar in /in/pt77Z on line 8 string(10) "no things!"
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/pt77Z on line 5
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/pt77Z 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/pt77Z on line 5
Process exited with code 255.