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run code in 150+ php & hhvm versions
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<?php echo rawurlencode('<TrackRequestUSERID="xxxxxxxxxxxx">    <TrackID ID="EJ958083578US"></TrackID></TrackRequest>');
based on uTnOA
Output for 4.3.0 - 7.1.0
%3CTrackRequestUSERID%3D%22xxxxxxxxxxxx%22%3E%C2%A0%C2%A0%C2%A0%C2%A0%3CTrackID%20ID%3D%22EJ958083578US%22%3E%3C%2FTrackID%3E%3C%2FTrackRequest%3E