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run code in 150+ php & hhvm versions
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<?php $a = array(); $tmp = array('b','a'); $a[]=$tmp; print_r($a); array_key_exists("test", $a);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => b [1] => a ) )