get_results( "SELECT meta_key FROM $wpdb->postmeta", ARRAY_A ); $meta_array = array(); foreach( $meta_keys as $key ){ $first_char = substr( $key['meta_key'], 0, 1 ); if( $first_char != '_' ){ array_push( $meta_array, $key['meta_key'] ); } } $meta_array = array_unique( $meta_array ); ?>