Hot answers tagged user-meta
If I understand problem correctly, you want to store name of multiple files in user meta field. add_user_meta function has fourth argument $unique which is false by default that means for each call to add_user_meta a new key-value pair is added, even if key already exists. add_user_meta has less clarification then the add_post_meta that does exactly same ...
You can use get_current_user_id() - if a user is not logged in, the value will be 0: <a href="http://example.com/uid=<?php echo get_current_user_id() ?>">...</a>
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