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run code in 150+ php & hhvm versions
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<?php error_reporting(E_ALL); $test = array(); $test['key'][] = 'setting'; var_dump($test);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["key"]=> array(1) { [0]=> string(7) "setting" } }