您已将MySQL的STRICT模式设置为OFF. 打开它，您会得到一个错误.

You have MySQL's STRICT mode OFF. Turn it on and you'll get an error.

否则，您可以通过以下方式使用PDO测试这些警告: http://php.net /manual/en/pdo.errorinfo.php

Otherwise you can test for those warnings with PDO via: http://php.net/manual/en/pdo.errorinfo.php