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<?php $arr = [ 1 => 'Hello', 3 => 'World', ]; $ix = 1; $arr[$ix+1] = 'Brave New'; var_dump($arr);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [1]=> string(5) "Hello" [3]=> string(5) "World" [2]=> string(9) "Brave New" }

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