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run code in 200+ php & hhvm versions
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<?php $arr = array(5=>1, 12=>2); $arr[] = 56; var_dump($arr); $arr["x"] = 42; unset($arr[5]); unset($arr); ?>
based on iNn7P
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array(3) { [5]=> int(1) [12]=> int(2) [13]=> int(56) }