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<?php $args = array(); $args['terms_names'] = array( 'category' => array('UK'), 'post_tag' => array('Tag1','Tag2') ); print_r($args);
Output for 4.3.0 - 7.1.0
Array ( [terms_names] => Array ( [category] => Array ( [0] => UK ) [post_tag] => Array ( [0] => Tag1 [1] => Tag2 ) ) )