php framework - thinkPHP is written in DB_DSN and it is pdo mode. If it is not written, it is mysql mode?

<code>'DB_TYPE'=>'mysql', //数据库类型
'DB_USER'=>'root', //用户名
'DB_PWD'=>'123456', //密码
'DB_PREFIX'=>'think_', //数据库表前缀
'DB_DSN'=>'mysql:host=localhost;dbname=thinkphp;charset=UTF8',  //★★注意这里. </code>

If you write 'DB_DSN' like this, it will automatically use PDO to connect. If you don't write 'DB_DSN', it will be mysql connection?

Or do you still use Pdo to connect regardless of writing or not?

How to connect using other parameter settings?

Reply content:

<code>'DB_TYPE'=>'mysql', //数据库类型
'DB_USER'=>'root', //用户名
'DB_PWD'=>'123456', //密码
'DB_PREFIX'=>'think_', //数据库表前缀
'DB_DSN'=>'mysql:host=localhost;dbname=thinkphp;charset=UTF8',  //★★注意这里. </code>

If you write 'DB_DSN' like this, it will automatically use PDO to connect. If you don't write 'DB_DSN', it will be mysql connection?

Or do you still use Pdo to connect regardless of writing or not?

How to connect using other parameter settings?

For versions below TP3.2.3, if DB_TYPE uses the PDO type, the database type is determined by the DB_DSN configuration. Version 3.2.3 or above, DB_DSN does not require setting, it is automatically set by the system. If it is version 3.2.3, since the PDO method is all used, DB_TYPE needs to be configured as the actual database type. It is no longer supported to be set to PDO, and there is no distinction between mysql and mysqli. Reference document I hope it will be helpful to you