php download link with expire time check download source

1 day ago 1
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I have a table when I srtore link to download and expire time (30 minutes for example). Then I send user an email with link to download file.

Is there a way to detect if the user followed download link from his email? Or he shared link in public and someone else clicked the link?

id | filename | expires ----------------------+--------------------+-------------------- fsdhfs7dfsniuf92un3f2 | link1.doc | 2012-03-23 23:32:32 sdf8shdf829nf32ufn23f | link2.doc | 2012-03-13 23:32:33
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