我想到的是通过global $post, 下一步是通过$post->post_name, 接下来检查slug是否需要使用utm查询更新链接。

就像这样。

// get the current post
global $post;

// get the post slug, if not set then set it to empty string
$post_slug = $post->post_name ?? \'\';

// an array of slugs that need to add utm to link
$utm_slugs = [
    \'slug-1\',
    \'slug-2\',
    \'slug-3\'
];

// set default value (empty string), in case no slug was matched
$utm_query = \'\';

// if post slug exists and in the utm slugs array, set a utm query
if (!empty($post_slug) && in_array($post_slug, $utm_slugs)) $utm_query = \'?utm_source=\' . $post_slug;

<a href="http://domain.com/<?= $utm_query; ?>">Some link</a>