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<?php $args = array(); $args['terms_names'] = array( 'category' => array('UK'), 'post_tag' => array('Tag1','Tag2') ); print_r($args['terms_names']['category']);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => UK )