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run code in 150+ php & hhvm versions
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<?php $ach = array(); $ach[]['test'] = "okay"; echo var_dump($ach);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(1) { [0]=> array(1) { ["test"]=> string(4) "okay" } }