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What would you do if the user uses a proxy and randomizes his IP address? There are numerous browser plugins to simplify that to a click of a button to download multiple times. The same goes for cookies. Aside from that you are trying to collect data that allows to identify users, which is illegal in lots of countries. What (could) work much better is a ...
URL-encode spaces beforehand: make_clickable( str_replace( ' ', '%20', $text ) );
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