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run code in 150+ php & hhvm versions
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<?php $a = array('a', 4=> 'b', 'c'); var_dump($a);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(1) "a" [4]=> string(1) "b" [5]=> string(1) "c" }
Output for hhvm-3.10.0

Process exited with code 153.