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run code in 150+ php & hhvm versions
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<?php $original = array( 'a','b','c','d','e' ); $inserted = array( 'x' ); array_splice( $original, 3, 0, $inserted ); var_dump($original);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(6) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "x" [4]=> string(1) "d" [5]=> string(1) "e" }