如果您要对wordpress的核心文件进行更改，那么在wordpress的下一次升级中，更改将丢失。

如果您想编辑登录名。php您需要创建一个自定义函数，该函数将覆盖默认函数（用于“UserName”）

您可以点击此链接

How to login with email only no username?

我们需要做的第一件事是删除默认的身份验证权限。将以下代码段添加到函数中。php文件：

//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
            $error->add(\'empty_username\', __(\'<strong>ERROR</strong>: Email field is empty.\'));
        }
        else if(!filter_var($email, FILTER_VALIDATE_EMAIL)){ //Invalid Email
            $error->add(\'invalid_username\', __(\'<strong>ERROR</strong>: Email is invalid.\'));
        }

        if(empty($password)){ //No password
            $error->add(\'empty_password\', __(\'<strong>ERROR</strong>: 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\', __(\'<strong>ERROR</strong>: 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\', __(\'<strong>ERROR</strong>: Either the email or password you entered is invalid.\'));
            return $error;
        }else{
            return $user; //passed
        }
    }
}, 20, 3);

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