What should php users pay attention to when logging in?
The password must be encrypted using MD5 (password string).
The name of the login form should not be the same as the database field to avoid exposing the table fields.
The table name, field name, and password of the user table should be difficult to guess.
Use verification code to verify login to prevent brute force cracking.
Verify whether the submitted data comes from this website. (Recommended learning: PHP programming from entry to proficiency)
The database part of the login background processing code uses preprocessing and filtering to prevent SQL injection.
For example: it needs to handle authentication, confirm email, update account (password, email) and other things.
<?php function user_change_email ($password1,$new_email,$user_name) { global $feedback,$hidden_hash_var; if (validate_email($new_email)) { $hash=md5($new_email.$hidden_hash_var); file://改变数据库中确认用的无序码值,但不改变email file://发出一个带有新认证码的确认email $user_name=strtolower($user_name); $password1=strtolower($password1); $sql="UPDATE user SET confirm_hash='$hash' WHERE user_name='$user_name' AND password='". md5($password1) ."'"; $result=db_query($sql); if (!$result || db_affected_rows($result) < 1) { $feedback .= ' ERROR - Incorrect User Name Or Password '; return false; } else { $feedback .= ' Confirmation Sent '; user_send_confirm_email($new_email,$hash); return true; } } else { $feedback .= ' New Email Address Appears Invalid '; return false; } } function user_confirm($hash,$email) { /* 用户点击认证email的相关连接时,连到一个确认的页面,该页面会调用这个函数, */ global $feedback,$hidden_hash_var; file://verify that they didn't tamper with the email address $new_hash=md5($email.$hidden_hash_var); if ($new_hash && ($new_hash==$hash)) { file://在数据库中找出这个记录 $sql="SELECT * FROM user WHERE confirm_hash='$hash'"; $result=db_query($sql); if (!$result || db_numrows($result) < 1) { $feedback .= ' ERROR - Hash Not Found '; return false; } else { file://确认email,并且设置帐号为已经激活 $feedback .= ' User Account Updated - You Are Now Logged In '; user_set_tokens(db_result($result,0,'user_name')); $sql="UPDATE user SET email='$email',is_confirmed='1' WHERE confirm_hash='$hash'"; $result=db_query($sql); return true; } } else { $feedback .= ' HASH INVALID - UPDATE FAILED '; return false; } } function user_send_confirm_email($email,$hash) { /* 这个函数在首次注册或者改变email地址时使用 */ $message = "Thank You For Registering at Company.com". " Simply follow this link to confirm your registration: ". " http://www.company.com/account/confirm.php?hash=$hash&email=". urlencode($email). " Once you confirm, you can use the services on PHPBuilder."; mail ($email,'Registration Confirmation',$message,'From: noreply@company.com'); } ?>
Perhaps we do not use this method for user authentication, but session and other methods, but this article still inspires us in terms of how to encrypt and confirm.
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