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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = new stdClass(); $a->{0} = 'X'; $a->{1} = 'Y'; $x = unserialize(serialize($a)); $prop = 1; var_dump($x->$prop, $x->${"$prop"});
Output for 7.1.0
Notice: Undefined variable: 1 in /in/R8NTW on line 7 Notice: Undefined property: stdClass::$ in /in/R8NTW on line 7 string(1) "Y" NULL
Output for 7.0.0 - 7.0.14
Notice: Undefined variable: 1 in /in/R8NTW on line 7 Fatal error: Uncaught Error: Cannot access empty property in /in/R8NTW:7 Stack trace: #0 {main} thrown in /in/R8NTW on line 7
Process exited with code 255.
Output for 5.0.5 - 5.2.5, 5.3.9 - 5.6.28
Notice: Undefined variable: 1 in /in/R8NTW on line 7 Fatal error: Cannot access empty property in /in/R8NTW on line 7
Process exited with code 255.
Output for 5.2.6 - 5.3.8
Notice: Undefined property: stdClass::$1 in /in/R8NTW on line 7 Notice: Undefined variable: 1 in /in/R8NTW on line 7 Fatal error: Cannot access empty property in /in/R8NTW on line 7
Process exited with code 255.
Output for 5.0.4
Notice: Undefined variable: 1 in /in/R8NTW on line 7 Notice: Undefined property: stdClass::$ in /in/R8NTW on line 7 string(1) "Y" NULL
Output for 5.0.0 - 5.0.3
Notice: Undefined variable: 1 in /in/R8NTW on line 7 Notice: Undefined property: stdClass::$ in /in/R8NTW on line 7 string(1) "Y" NULL
Output for 4.3.3 - 4.4.9
Fatal error: Property name must be a string in /in/R8NTW on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.