Heres is all relevant code. What I want to do is sent some parameters to a php file using ajax, and check if they are in db. If not echo and error message and if they are echo success message. I don't know how to retrieve all result from the database and compare them with the ones I input. Thank you.Heres is all relevant code. What I want to do i
阅读背景：
有人可以举例说明如何使用PDO检查数据库中是否存在电子邮件和密码？ （对于DUMMIES）。
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