Detect if an old URL was used to reach the page

  • I’m trying to determine if someone reached my page using the old URL structure or not.

    Old URL = example.com/?p=100
    New URL = example.com/2013/10/14/sample-post

    If someone visits my site using the old URL they are redirect to the new URL as expected. I would like to know that they originally hit the page using the old (original) URL and display a message to change their bookmark.

    The usual situation is that my folks have the old URL bookmarked, so using $_SERVER[‘HTTP_REFERER’] simply comes up empty.

    If they have clicked on a link on a page it comes up with the appropriate refferer information and not that they used the old URL.

    Any ideas?

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