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<?php $array['meta_query'][] = array( 'key' => 'price', 'compare' => 'NOT EXISTS', 'value' => '', ); print_r($array);
Output for 4.3.0 - 7.2.0
Array ( [meta_query] => Array ( [0] => Array ( [key] => price [compare] => NOT EXISTS [value] => ) ) )