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run code in 150+ php & hhvm versions
Bugs & Features
<?php class Test { function __toString() { return 'Test'; } } $a = array('XTest' => 'foo'); $b = new Test(); var_dump($a[$b]);
Output for 4.3.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: Illegal offset type in /in/HeSTG on line 12 NULL
Output for hhvm-3.10.0 - 3.12.0
Warning: Invalid operand type was used: Invalid type used as key in /in/HeSTG on line 12 Notice: Undefined index: Test in /in/HeSTG on line 12 NULL