mysqli_warning::next

The mysqli_warning::next() function is used to get the next warning message.

usage:

 bool mysqli_warning::next ( void )

This function has no parameters.

Return value:

• Return true if the next warning message is successfully obtained.
• If no more warning information is available, false is returned.

Example:

 <?php // 创建一个数据库连接$mysqli = new mysqli("localhost", "username", "password", "database"); // 检查连接是否成功if ($mysqli->connect_errno) { echo "连接数据库失败：" . $mysqli->connect_error; exit(); } // 执行一个可能会产生警告的查询$query = "SELECT * FROM my_table"; $result = $mysqli->query($query); // 检查是否有警告信息if ($mysqli->warning_count > 0) { // 获取第一个警告信息$warning = $mysqli->get_warnings(); // 循环获取所有警告信息while ($warning != null) { echo "警告： " . $warning->message . "<br>"; // 获取下一个警告信息$warning->next(); } } // 关闭数据库连接$mysqli->close(); ?>

In the example above, we first create a database connection and execute a query that may generate warnings. We then check if there is a warning message available. If so, we use the mysqli::get_warnings() function to get the first warning information and use the mysqli_warning::next() function to loop over the remaining warning information. Finally, we close the database connection.

Please note that before using the mysqli_warning::next() function, we first need to use the mysqli::get_warnings() function to get the first warning message.