WordPress实现用户使用Email地址登录

[tr][td]对于忘记注册的用户名这种情况，可谓再常见不过了……幸运的是，您可以在登录界面增加一个“使用Email登录”的选项，这样，我们可爱的用户应该不会再为登录不上 WordPress 而苦恼了吧？代码添加 Email 登录功能，添加以下代码至 Functions.php：

[*]//remove wordpress authentication
[*]remove_filter(‘authenticate’, ‘wp_authenticate_username_password’, 20);
[*]
[*]add_filter(‘authenticate’, function($user, $email, $password){
[*]
[*] //Check for empty fields
[*] if(empty($email) || empty ($password)){
[*] //create new error object and add errors to it.
[*] $error = new WP_Error();
[*]
[*] if(empty($email)){ //No email
[*] $error->add(’empty_username’, __(‘ERROR: Email field is empty.’));
[*] }
[*] else if(!filter_var($email, FILTER_VALIDATE_EMAIL)){ //Invalid Email
[*] $error->add(‘invalid_username’, __(‘ERROR: Email is invalid.’));
[*] }
[*]
[*] if(empty($password)){ //No password
[*] $error->add(’empty_password’, __(‘ERROR: Password field is empty.’));
[*] }
[*]
[*] return $error;
[*] }
[*]
[*] //Check if user exists in WordPress database
[*] $user = get_user_by(‘email‘, $email);
[*]
[*] //bad email
[*] if(!$user){
[*] $error = new WP_Error();
[*] $error->add(‘invalid’, __(‘ERROR: Either the email or password you entered is invalid.’));
[*] return $error;
[*] }
[*] else{ //check password
[*] if(!wp_check_password($password, $user->user_pass, $user->ID)){ //bad password
[*] $error = new WP_Error();
[*] $error->add(‘invalid’, __(‘ERROR: Either the email or password you entered is invalid.’));
[*] return $error;
[*] }else{
[*] return $user; //passed
[*] }
[*] }
[*]}, 20, 3);

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