WordPress: How to get all sub categories id and add the parent category’s ID to the new array?

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I want to get all the sub categories’ ID and add all the sub cat IDs and the parent ID　to a new array?

For example:
Parent $ID=1
sub cat 1 :11
sub cat 2 :12
sub cat 3 :13
sub cat 4 :14

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$arr = array(11,12,13,14)

The result: $arr2 = array(1,11,12,13,14) // add parent ID to the array.

$categories=get_categories($ID);

Then I don’t know what to do, please help me to solve the problem. Thanks.

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  1. 1.) get_all_category_ids() will retrive all the category IDS. it returns an array containing both the child and parent category ID’es.

    2.) If you want to get it for a particular category: (Note: it will include all the child/child*n as well) 

     //$pid = parent category id
$Result = array_merge(array_diff(explode('/',get_category_children($pid)),array("")),array($pid));

    3.) if you want only the immediate child categories: ie: parent/child and not parent/child/child*n 

                //$pid = parent category id;         
            $child_cats=array();

            foreach(get_all_category_ids() as $cat)
            {
                if(get_category($cat)->parent==$pid)
                {
                    $child_cats[]=$cat;
                }
            }

            $result = array_merge($child_cats,array($pid));