3v4l.org

run code in 150+ php & hhvm versions
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<?php $a = array(1, 2, 3); unset($a[2]); $a[] = "4"; print_r($a);
based on ut9nZ
Output for 4.3.0 - 7.1.0
Array ( [0] => 1 [1] => 2 [3] => 4 )