有两种处理方法。

a. Attach a timer to the notice:

您可以在通知上附加一个3秒计时器（或任意长的计时器），如下所示：

<?php
set_transient( "my-plugin", "alive", 3 );
add_action( \'admin_notices\', function() {
   //Syntax correction
    if ( "alive" == get_transient( "my-plugin" ) ) {
        ?>
        <div class="notice notice-success is-dismissible">
            <p><?php _e( \'Imagine something here!\', \'sample-text-domain\' ); ?></p>
        </div>
        <?php
        delete_transient( "my-plugin" );
    }
});

3秒钟后，瞬态将过期，并且将来对admin_notices 挂钩函数不会显示通知。插件安装完成后，应该有足够的时间在第一页刷新时显示通知。您可以根据需要使用计时器。

b. Keep a history of the dismissal of the notice, with your own dismiss action:

function my_plugin_notice() {
    $user_id = get_current_user_id();
    if ( !get_user_meta( $user_id, \'my_plugin_notice_dismissed\' ) ) 
        echo \'<div class="notice"><p>\' . _e( \'Imagine something here!\', \'sample-text-domain\' ) . \'</p><a href="?my-plugin-dismissed">Dismiss</a></div>\';
}
add_action( \'admin_notices\', \'my_plugin_notice\' );
    
function my_plugin_notice_dismissed() {
    $user_id = get_current_user_id();
    if ( isset( $_GET[\'my-plugin-dismissed\'] ) )
        add_user_meta( $user_id, \'my_plugin_notice_dismissed\', \'true\', true );
}
add_action( \'admin_init\', \'my_plugin_notice_dismissed\' );

一旦解除，用户元将使用该信息更新，并且admin_notices 钩子函数将对此进行检查，并且仅在不正确时显示消息。