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<?php $arr = [1=>[[100]], 2=>[[200]]]; $ref = &$arr[1]; $ref[] = array_merge([], [101]); var_dump($arr);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [1]=> &array(2) { [0]=> array(1) { [0]=> int(100) } [1]=> array(1) { [0]=> int(101) } } [2]=> array(1) { [0]=> array(1) { [0]=> int(200) } } }

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