我一直在尝试破译一种在第一次登录时向用户显示消息的方法，但似乎无法使其正常工作。我不确定我错过了什么，或者我是否还有其他事情需要做。任何帮助都将不胜感激。我觉得我错过了什么。

function ap_new_user_message() {
    $current_user = wp_get_current_user();
    $user_ID = $current_user->ID;
    //global $user_ID;
    if( $user_ID ) {
        $user_info = get_userdata( $user_ID );
        // If user_registered date/time is less than 48hrs from now
        // Message will show for 48hrs after registration
        if ( strtotime( $user_info->user_registered ) > ( time() - 172800 ) )
        echo \'<div>display a message</div>\';
    }
}

或者，如果我能找到一种方法来确定用户创建以来已经有多少天了，我可以做类似的事情。也许通过添加到用户元表？

function first_login($login) {
    global $user_ID;
    $user = get_userdatabylogin($login);
    update_usermeta( $user->ID, \'first_login\', date(), time() );
  }
add_action(\'wp_login\',\'first_login\');

然后要求

if first_login(date, time) == (today, ago) {
#do something
}

Update:米洛的代码工作得很好。然而，我需要它来处理Eric Meyer的简单模式登录。我在SimpleModel登录中找到了这个函数。php和peter的登录重定向。

        function login_redirect($redirect_to, $req_redirect_to, $user) {
        if (!isset($user->user_login) || !$this->is_ajax()) {
            return $redirect_to;
        }
        if ($this->is_plugin_active(\'peters-login-redirect/wplogin_redirect.php\')
                && function_exists(\'redirect_to_front_page\')) {
            $redirect_to = redirect_to_front_page($redirect_to, $req_redirect_to, $user);
        }
        echo "<div id=\'simplemodal-login-redirect\'>$redirect_to</div>";
        exit();
    }

并将Milo的重定向添加到它，如下所示：

    function login_redirect($redirect_to, $req_redirect_to, $user) {
        $regtime = strtotime($user->user_registered);
        $now = strtotime("now");
        $diff = $now - $regtime;
        $hours = $diff / 60 / 60;
        if (!isset($user->user_login) || !$this->is_ajax()) {
            return $redirect_to;
        }
        if ($this->is_plugin_active(\'peters-login-redirect/wplogin_redirect.php\')&& function_exists(\'redirect_to_front_page\')) {
            $redirect_to = redirect_to_front_page($redirect_to, $req_redirect_to, $user);
        }
        if( $hours < 48 ){
            $redirect_to = "/somepage/"; // it\'s been less than 48 hours, redirect to message.
        }
        echo "<div id=\'simplemodal-login-redirect\'>$redirect_to</div>";
        exit();
    }

现在我只需要确定当用户到达某个页面时如何强制弹出模型。

function my_redirect( $to, $requested, $user ){
    if( !isset( $user->user_login ) ){ // we only want this to run when credentials have been supplied
        return $to;
    }
    $regtime = strtotime($user->user_registered);
    $now = strtotime("now");
    $diff = $now - $regtime;
    $hours = $diff / 60 / 60;
    if( $hours < 48 ){
        return "/somepage/"; // it\'s been less than 48 hours, redirect to message.
    } else {
        return admin_url();
    }
}
add_filter(\'login_redirect\', \'my_redirect\', 10, 3);

/*
this is an redirect action
*/
function BB_ECC_login_redirect_code( $redirect_to, $request, $user  ) {

    $user_login_time = get_user_meta( $user->id , \'user_login_time\' , true );
    if( $user_login_time <= 1 ){
        $new_url = bp_core_get_user_domain( $user->id )."profile/";
        $user_login_time++;
        update_user_meta($user->id, \'user_login_time\', $user_login_time );
    }else{
        $new_url = bp_core_get_user_domain( $user->id )."dashboard/";
    }

    return ( is_array( $user->roles ) && in_array( \'administrator\', $user->roles ) ) ? admin_url() : $new_url;
} 
add_filter( \'login_redirect\', \'BB_ECC_login_redirect_code\', 10, 3 );


function BB_ECC_add_meta_value_for_login_checking( $user_id ) {
    update_user_meta($user_id, \'user_login_time\', 1 );
}
add_action( \'user_register\', \'BB_ECC_add_meta_value_for_login_checking\', 10, 1 );