Markdown Light Edition

<?php

/*
 *   This code:
 *   - makes bold each part of text surrounded by ** (double star)
 *   - makes italic each part of text surrounded by // (double slash)
 *   - makes underline each part of text surrounded by __ (double underscore)
 */


$formatted = preg_replace( array( '#\*\*(.*)\*\*#sU',
                                  '#//(.*)//#sU',
                                  '#__(.*)__#sU'),
                           array( '<span style="font-weight:bold">$1</span>',
                                  '<span style="font-style:italic">$1</span>',
                                  '<span style="text-decoration:underline">$1</span>'),
                           $txt);

?>