mysql_field_flags

Function name: mysql_field_flags()

Applicable version: PHP 5.2.0 - PHP 5.4.45 (Deprecated)

Usage: The mysql_field_flags() function is used to get the flags (flags) of the specified field. This function needs to be called after using the mysql_fetch_field() function.

Syntax: string mysql_field_flags ( resource $result , int $field_offset )

parameter:

• $result: represents the identifier of the result set, that is, the result returned by the mysql_query() function.
• $field_offset: represents the index position of the field, starting from 0.

Return value: Returns a string containing the flag bits of the specified field. If an error occurs or the field does not exist, false is returned.

Example:

 // 连接到MySQL数据库$link = mysql_connect('localhost', 'username', 'password'); if (!$link) { die('连接数据库失败: ' . mysql_error()); } // 选择数据库$db_selected = mysql_select_db('mydb', $link); if (!$db_selected) { die('选择数据库失败: ' . mysql_error()); } // 执行查询$result = mysql_query('SELECT * FROM mytable'); if (!$result) { die('查询失败: ' . mysql_error()); } // 获取第一个字段的标志位$field_flags = mysql_field_flags($result, 0); if ($field_flags) { echo '第一个字段的标志位为: ' . $field_flags; } else { echo '获取字段标志位失败'; } // 释放结果集mysql_free_result($result); // 关闭数据库连接mysql_close($link);

In the above example, first connect to the MySQL database through the mysql_connect() function, and then select the database through the mysql_select_db() function. Then use the mysql_query() function to perform the query operation, and obtain the flag bits of the first field in the result set through the mysql_field_flags() function. Finally, release the result set and close the database connection.

It should be noted that the mysql_field_flags() function was abandoned after PHP 5.5.0. It is recommended to use mysqli or PDO extension instead.