How do i put in user id in a banner

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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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)