get sub categories of several categories with get_categories()

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Is there a way to get all sub categories of several categories? something like: 

get_categories( array( 'child_of'=>array(10,3,8) );
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  1. It’s not possible, wordpress just accepts one integer in all it’s functions that get categories children. You’ll have to get their children separately:

    $terms = array();
$taxonomy = 'category';
$parents = array(10, 3, 8);
foreach ($parents as $parent) {
    $terms = array_merge($terms, get_categories(array('child_of'=> $parent)));
}

foreach ($terms as $term) {
    // your code here
}

    Hope it helps!

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