MAP
$meta_query = array( 'relation' => 'OR', array( 'key' => 'city', 'value' => 'chennai', 'compare' => 'LIKE', ), array( 'key' => 'pin_code', 'value' => '600008', ), );
$meta_query = array( 'relation' => 'OR', array( 'key' => 'city', 'value' => 'chennai', 'compare' => 'LIKE', ), array( 'key' => 'pin_code', 'value' => '600008', ), );