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run code in 150+ php & hhvm versions
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<?php $args = array(); $args['terms_names'] = array( 'category' => array('UK') ); print_r($args);
Output for 4.3.0 - 5.6.22, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [terms_names] => Array ( [category] => Array ( [0] => UK ) ) )