PHP Fatal error:undefined class constant ' Mysql_attr_init_command '

Recently with Thinkphp, to the company to decorate the online site, encountered a problem, record.

Open IE settings, advanced Internet Options, will be "show friendly HTTP error message" Before all check out!

Refresh again, see the error is:

PHP Fatal error:undefined class constant ' Mysql_attr_init_command ' in C:\inetpub\wwwroot\www\simplewind\Core\Library\ Think\db\driver\mysql.class.php on line 36

As you can see here, thinkphp uses the PDO interface to access the MySQL database, but PDO is turned off by default in the PHP.ini configuration.

So, turn on Php_pdo_mysql.dll in php.ini configuration (remove the previous; character)

PHP Fatal error:undefined class constant ' Mysql_attr_init_command '