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run code in 150+ php & hhvm versions
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<?php class PushAndPull { private $queue=array(); public function push($push) { array_push($this->$queue,$push); } public function pull() { return array_shift($this->$queue); } } $obj = new PushAndPull(); $obj->$queue=array(""); $obj->push(1);
Output for 5.0.4, 7.1.0
Notice: Undefined variable: queue in /in/PXs1l on line 22 Notice: Undefined variable: queue in /in/PXs1l on line 10
Output for 7.0.0 - 7.0.14
Notice: Undefined variable: queue in /in/PXs1l on line 22 Fatal error: Uncaught Error: Cannot access empty property in /in/PXs1l:22 Stack trace: #0 {main} thrown in /in/PXs1l on line 22
Process exited with code 255.
Output for hhvm-3.12.0
Fatal error: Cannot access empty property in /in/PXs1l on line 22
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: queue in /in/PXs1l on line 22 Fatal error: Cannot access empty property in /in/PXs1l on line 22
Process exited with code 255.
Output for 5.0.0 - 5.0.3
Notice: Undefined variable: queue in /in/PXs1l on line 22 Notice: Undefined variable: queue in /in/PXs1l on line 10
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/PXs1l 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/PXs1l 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/PXs1l on line 5
Process exited with code 255.