What does this preg=?iso-8859-1?Q?=5Freplace_do=3F_?==?iso-8859-1?Q?(/[\xF0-\xF7]=83=3F=3F/?=)

What does this preg_replace do? (/[\xF0-\xF7]ƒ??/)

References

Reference NO 1

http://php.net/manual/en/function.utf8-encode.php

Reference NO 2

http://stackoverflow.com/questions/16937179/trying-to-understand-exif-encode-unicode

Reference NO 3

https://drupal.org/node/1823202

Reference NO 4

https://github.com/semsol/arc2/blob/master/ARC2.php

Reference NO 5

http://www.graner.net/projects/speech/thetable.phps

Reference NO 6

http://www.xuchao.org/docs/php/function.utf8-decode.html

Reference NO 7

http://sourceforge.net/mailarchive/forum.php?set=custom&viewmonth=201107&viewday=&forum_name=xoops-cvs2&style=nested&max_rows=75&submit=Change+View

Reference NO 8

https://www.torrenttrader.org/topic/11955-addon-magnet-link-in-torrent-details/