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<?php $arr = [2 => ['b', 'c'], 1 => ['a']]; krsort($arr); var_dump(call_user_func_array('array_merge', $arr));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(1) "b" [1]=> string(1) "c" [2]=> string(1) "a" }

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