基本上，要登录用户，您可以使用：

            //Login the user
    $creds = array();
    $creds[\'user_login\'] = $login;
    $creds[\'user_password\'] = $password;
    if ( !empty( $remember ) ){ 
        $creds[\'remember\'] = true;
    }
    $user = wp_signon( $creds, true );

//Only after Everything has been validated, proceed with creating the user
        //Create the user
        $user_pass = wp_generate_password();
        $user = array(
            \'user_login\' => $username,
            \'user_pass\' => $user_pass,
            \'first_name\' => $firstname,
            \'last_name\' => $lastname,
            \'user_email\' => $email
        );
        $user_id = wp_insert_user( $user );

        /*Send e-mail to admin and new user - 
        You could create your own e-mail instead of using this function*/
        wp_new_user_notification( $user_id, $user_pass );

希望这有帮助

没有一个理想的地方可以参与注册过程。我认为在core中添加一个用户注册事件操作挂钩是很有必要的。但我想你也可以假装一下。用户成功注册后发生的最后一件事是创建一个名为“default\\u password\\u nag”的用户选项。我们可以创建一个操作来监视它，并在设置时设置用户。

add_action(\'update_user_metadata\', \'my_auto_login\', 10, 4);

function my_auto_login( $metaid, $userid, $key, $value ) {
    // We only care about the password nag event. Ignore anything else.
    if ( \'default_password_nag\' !== $key  && true !== $value) {
        return;
    }

    // Set the current user variables, and give him a cookie. 
    wp_set_current_user( $userid );
    wp_set_auth_cookie( $userid );
}

现在我们已经知道该怎么做了，我认为这是一个坏主意，从安全角度来看。人们可以创建垃圾邮件帐户，甚至不必麻烦地设置垃圾邮件投递箱。：）

我刚刚通过使用user_register hook 以及my函数中的以下代码。php：

// auto log in a user who has just signed up       
function auto_login_new_user( $user_id ) {
  wp_set_auth_cookie( $user_id, false, is_ssl() );
}
add_action( \'user_register\', \'auto_login_new_user\' );

function login_after_register($userlogin,$userpass){
    $credentials = array( \'user_login\' =>  $userlogin, \'user_password\' => $userpass, \'remember\' => true );

    $secure_cookie = is_ssl();

    $secure_cookie = apply_filters(\'secure_signon_cookie\', $secure_cookie, $credentials);
    add_filter(\'authenticate\', \'wp_authenticate_cookie\', 30, 3);

    $user = wp_authenticate($credentials[\'user_login\'], $credentials[\'user_password\']);
    wp_set_auth_cookie($user->ID, $credentials["remember"], $secure_cookie);
    do_action(\'wp_login\', $user->user_login, $user);
}