您正在查找Flash消息。Flash消息是存储在会话中的消息，检索后立即删除。您可以在github上找到一些实现：https://github.com/plasticbrain/PhpFlashMessages

<?php 

// Start a Session
// Read about managing session with WordPress

// Instantiate the class
$fm = new \\Plasticbrain\\FlashMessages\\FlashMessages();

// Process form e.g. send an email and add success message
$msg->success(\'Thank you for sending message!\');

// Display message
if( $fm->hasMessages(\'success\') ) {

    /**
     * This line will display success message and also remove it
     * from session. After refresh $fm->hasMessages(\'success\')
     * will return false
     */ 
    $fm->display(\'success\'); 
}