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run code in 150+ php & hhvm versions
Bugs & Features
<?php $t = (object)['foo' => 'bar']; var_dump($t->foo); $t = (object)['foo']; var_dump($t->{null});
Output for 7.1.0
string(3) "bar" Notice: Undefined property: stdClass::$ in /in/YsKG2 on line 8 NULL
Output for 7.0.0 - 7.0.14
string(3) "bar" Fatal error: Uncaught Error: Cannot access empty property in /in/YsKG2:8 Stack trace: #0 {main} thrown in /in/YsKG2 on line 8
Process exited with code 255.
Output for 5.4.0 - 5.6.28, hhvm-3.12.0
string(3) "bar" Fatal error: Cannot access empty property in /in/YsKG2 on line 8
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/YsKG2 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/YsKG2 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/YsKG2 on line 3
Process exited with code 255.