Multi_query PHP MySQLi

Question

function search_admin($q) {
    $db = load_db();
    $sql = "SELECT keyword FROM keyword WHERE keyword LIKE = '%{$q}%'";
    $sql .= " SELECT title, status
              FROM title
              WHERE CONCAT(title, ' ', status)
              LIKE '%{$q}%'";
    $sql .= " SELECT first_name, middle_name, last_name, cbemail
              FROM employees
              WHERE CONCAT(first_name, ' ' , middle_name, ' ' , last_name , ' ' , cbemail)
              LIKE '%{$q}%'";
    $sql .= " SELECT username FROM users WHERE username LIKE = '%{$q}%'";

    $result = $db->multi_query($sql);

// missing code

}

我似乎无法理解php手册中的解释。我希望你能更多地启发我。这是一个搜索栏，如果他举例，他将搜索“待定”。代码将搜索3个表，即标题，员工和用户。然后输出结果。现在我的问题是在得到结果查询后该怎么做：/