How to add user login functionality to WordPress plugin

How to add user login function to WordPress plug-in

When developing WordPress plug-in, sometimes we need to add user login function to the plug-in to facilitate specific users Rights management, data saving and other operations. This article will introduce how to add user login functionality to WordPress plugins and provide corresponding code examples.

Before we start, we need to understand some functions and methods related to WordPress user login to facilitate subsequent development.

1. wp_login_form(): Outputs a simple login form, used to display the user login interface in the foreground.
2. wp_login_url(): Obtains the URL address of the user's login, which can be used to generate a login link in the plug-in.
3. is_user_logged_in(): Determine whether the current user is logged in.
4. wp_logout(): Log out the currently logged in user.
5. wp_create_user(): Create a new user.
6. wp_set_auth_cookie(): Set the user's authentication cookie.
7. wp_redirect(): Jump to the page.

Next, we will use a specific example to add user login functionality to the WordPress plug-in.

1. First, add the following code to the main file of the plug-in:

/*
Plugin Name: My Plugin
*/

// 添加登录链接
function my_plugin_menu() {
    add_menu_page('My Plugin', 'My Plugin', 'edit_posts', 'my-plugin', 'my_plugin_page');
}
add_action('admin_menu', 'my_plugin_menu');

// 登录页面
function my_plugin_page() {
    if(!is_user_logged_in()) {
        echo '<h2 id="Please-a-href-wp-login-url-log-in-a-to-use-this-plugin">Please <a href="' . wp_login_url() . '">log in</a> to use this plugin.</h2>';
    } else {
        // 插件功能代码
    }
}

// 注册用户登录成功后的回调函数
function my_login_redirect($redirect_to, $request, $user) {
    return admin_url('admin.php?page=my-plugin');
}
add_filter('login_redirect', 'my_login_redirect', 10, 3);

2. In the above code, a menu page is first added through the add_menu_page() function , only users with edit_posts permission can access. In the my_plugin_page() function, determine whether the user is logged in by judging the is_user_logged_in() function. If the user is not logged in, a login link will be displayed. Clicking the link will jump to the WordPress default login page. If the user is logged in, the plugin function code is displayed.
3. In the above code, a callback function my_login_redirect() is also registered through the add_filter() function, which is used to jump after the user successfully logs in. In this callback function, the page to be redirected after the user successfully logs in is specified by returning admin_url('admin.php?page=my-plugin').

The above completes the development of adding user login function to WordPress plug-in. You can add the corresponding plug-in function code in the my_plugin_page() function according to the specific needs of the plug-in.

I hope this article can be helpful to your WordPress plug-in development work!

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