您可以这样做：

function filterDocumentTitle(string $title): string
{
    // don\'t change title on admin pages or when global $post is not loaded
    if (is_admin() || get_the_ID() === false) {
        return $title;
    }

    // don\'t change title if shortcode is not present in content
    if (!has_shortcode(get_the_content(), \'caption\')) {
        return $title;
    }

    return \'special title\';
}

add_filter(\'pre_get_document_title\', \'filterDocumentTitle\');

在上面的代码中，我检查[caption] shortcode，我在本地使用它进行测试，将其替换为您真正的shortcode名称（没有[ 和]).

这样，您就可以知道您的短代码何时是页面的一部分，何时不是页面的一部分。现在剩下要做的就是获得你想要的标题值。由于缺乏更多信息，我假设您的短代码如下所示

add_shortcode(\'myshortcode\', function () {
    $id = intval($_GET[\'item\']);
    $eventData = /* .. get event data via ID */;
    return \'some contents depending on $eventData\';
});

function gholmesGetEventData(): array {
    if (empty($_GET[\'item\'])) {
        throw new Exception(\'Only supported when item is provided.\');
    }
    $id = intval($_GET[\'item\']);
    $eventData = /* .. get event data via ID, throw Exception if not found */;
    return $eventData;
}

add_shortcode(\'myshortcode\', function (): ?string {
    try {
        $eventData = gholmesGetEventData();
        return \'some contents depending on $eventData\';
    } catch (Exception $e) {
        // do something with the exception
        return null;
    }
});

function gholmesFilterDocumentTitle(string $title): string
{
    // don\'t change title on admin pages or when global $post is not loaded
    if (is_admin() || get_the_ID() === false) {
        return $title;
    }

    // don\'t change title if shortcode is not present in content
    if (!has_shortcode(get_the_content(), \'caption\')) {
        return $title;
    }

    try {
        $eventData = gholmesGetEventData();
        return $eventData[\'eventtitle\'];
    } catch (Exception $e) {
        return $title;
    }
}

add_filter(\'pre_get_document_title\', \'gholmesFilterDocumentTitle\');