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<?php echo urlencode('http://www.stylka.pl/wp-content/uploads/2014/07/ser-pleśniowy.jpg');
based on vQHWR
Output for 4.3.0 - 7.1.7
http%3A%2F%2Fwww.stylka.pl%2Fwp-content%2Fuploads%2F2014%2F07%2Fser-ple%C5%9Bniowy.jpg