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$previously_subscribed = ( $wpdb->get_var("SELECT comment_subscribe from $wpdb->comments WHERE comment_post_ID = '$postid' AND LCASE(comment_author_email) = '$email' AND comment_subscribe = 'Y' LIMIT 1") || in_array(stripslashes($email), (array)get_post_meta($postid, '_sg_subscribe-to-comments')) ) ? true : false;