Is there a function for getting the post/page that an attachment is related to?

There isn’t really a built-in way to return all the posts that an attachment is used in. The closest thing would probably be $post->post_parent which all attachments have post parents.

There is a plugin called Find Posts Using Attachment that does a good job of retrieving these and is a single file PHP class so you could possibly repurpose it to obtain the desired result.

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