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run code in 150+ php & hhvm versions
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<?php $test = array('t' => 'a'); $test[] = 'b'; var_dump($test);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0, 7.0.0 - 7.1.0
array(2) { ["t"]=> string(1) "a" [0]=> string(1) "b" }
Output for hhvm-3.12.0

Process exited with code 137.