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<?php $ar = ['a', 'b', 'c', 'd', 'e', 'f']; foreach ($ar as $k => & $v) { echo "$k: $v\n"; if ($v === 'b') array_splice($ar, $k, 1, ['x', 'y']); } echo "\n"; print_r($ar);
Output for git.master, git.master_jit, rfc.property-hooks
0: a 1: b 6: f Array ( [0] => a [1] => x [2] => y [3] => c [4] => d [5] => e [6] => f )

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