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run code in 150+ php & hhvm versions
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<?php $d = array(1,3,4,5); array_splice($d, 1, 0, 2); var_dump($d);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) }