如何创建受密码保护的注册表单，在提交之前根据数据库表检查密码？

I have a php registration form and one of the fields on the form is a password field and I want the form to check the password against a database table list of passwords before allowing the form to submit the user's info. So pretty much the user needs a password to register. I have been looking for a solution for this and have not come across one. I have a php registration form and one of the f