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run code in 200+ php & hhvm versions
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<?php $a = array(1,2,3,4,5); array_splice($a, 1, 0, 'test'); var_dump($a);
Output for 4.3.0 - 7.2.0
array(6) { [0]=> int(1) [1]=> string(4) "test" [2]=> int(2) [3]=> int(3) [4]=> int(4) [5]=> int(5) }