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<?php $a = ['a' => [1,2,3], 'b' => [4,5,6], 'c' => [7,8,9]]; array_splice($a, 0, 2, ['xxx' => [10,11,12]]); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> array(3) { [0]=> int(10) [1]=> int(11) [2]=> int(12) } ["c"]=> array(3) { [0]=> int(7) [1]=> int(8) [2]=> int(9) } }

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