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Kategorien (IN) nach ID

$tax_query = array(
	'relation' => 'OR',
	array(
		'taxonomy'         => 'category',
		'terms'            => array( 'term_ID1', 'term_ID2' ),
		'field'            => 'term_id',
		'operator'         => 'IN',
		'include_children' => true,
	),
);