WordPress 实现用户使用Email地址登录

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);

《WordPress 实现用户使用Email地址登录》有一个想法