friendica/include/bbcode.php

<?php
   //BBcode 2 HTML was written by WAY2WEB.net

   function bbcode($Text)
       {
         // Replace any html brackets with HTML Entities to prevent executing HTML or script
            // Don't use strip_tags here because it breaks [url] search by replacing & with amp
            $Text = str_replace("<", "&lt;", $Text);
            $Text = str_replace(">", "&gt;", $Text);

            // Convert new line chars to html <br /> tags
            $Text = nl2br($Text);

            // Set up the parameters for a URL search string
            $URLSearchString = " a-zA-Z0-9\:\/\-\?\&\.\=\_\~\#\'";
            // Set up the parameters for a MAIL search string
            $MAILSearchString = $URLSearchString . " a-zA-Z0-9\.@";

            // Perform URL Search
            $Text = preg_replace("/\[url\]([$URLSearchString]*)\[\/url\]/", '<a href="$1" target="_blank">$1</a>', $Text);
            $Text = preg_replace("(\[url\=([$URLSearchString]*)\](.+?)\[/url\])", '<a href="$1" target="_blank">$2</a>', $Text);
         //$Text = preg_replace("(\[url\=([$URLSearchString]*)\]([$URLSearchString]*)\[/url\])", '<a href="$1" target="_blank">$2</a>', $Text);

            // Perform MAIL Search
            $Text = preg_replace("(\[mail\]([$MAILSearchString]*)\[/mail\])", '<a href="mailto:$1">$1</a>', $Text);
            $Text = preg_replace("/\[mail\=([$MAILSearchString]*)\](.+?)\[\/mail\]/", '<a href="mailto:$1">$2</a>', $Text);
         
            // Check for bold text
            $Text = preg_replace("(\[b\](.+?)\[\/b])is",'<strong>$1</strong>',$Text);

            // Check for Italics text
            $Text = preg_replace("(\[i\](.+?)\[\/i\])is",'<em>$1</em>',$Text);

            // Check for Underline text
            $Text = preg_replace("(\[u\](.+?)\[\/u\])is",'<u>$1</u>',$Text);

            // Check for strike-through text
            $Text = preg_replace("(\[s\](.+?)\[\/s\])is",'<strike>$1</strike>',$Text);

            // Check for over-line text
            $Text = preg_replace("(\[o\](.+?)\[\/o\])is",'<span class="overline">$1</span>',$Text);

            // Check for colored text
            $Text = preg_replace("(\[color=(.+?)\](.+?)\[\/color\])is","<span style=\"color: $1\">$2</span>",$Text);

            // Check for sized text
            $Text = preg_replace("(\[size=(.+?)\](.+?)\[\/size\])is","<span style=\"font-size: $1px\">$2</span>",$Text);

            // Check for list text
            $Text = preg_replace("/\[list\](.+?)\[\/list\]/is", '<ul class="listbullet">$1</ul>' ,$Text);
            $Text = preg_replace("/\[list=1\](.+?)\[\/list\]/is", '<ul class="listdecimal">$1</ul>' ,$Text);
            $Text = preg_replace("/\[list=i\](.+?)\[\/list\]/s",'<ul class="listlowerroman">$1</ul>' ,$Text);
            $Text = preg_replace("/\[list=I\](.+?)\[\/list\]/s", '<ul class="listupperroman">$1</ul>' ,$Text);
            $Text = preg_replace("/\[list=a\](.+?)\[\/list\]/s", '<ul class="listloweralpha">$1</ul>' ,$Text);
            $Text = preg_replace("/\[list=A\](.+?)\[\/list\]/s", '<ul class="listupperalpha">$1</ul>' ,$Text);
            $Text = str_replace("[*]", "<li>", $Text);

            // Check for font change text
            $Text = preg_replace("(\[font=(.+?)\](.+?)\[\/font\])","<span style=\"font-family: $1;\">$2</span>",$Text);

            // Declare the format for [code] layout
            $CodeLayout = '<code>$1</code>';
            // Check for [code] text
            $Text = preg_replace("/\[code\](.+?)\[\/code\]/is","$CodeLayout", $Text);
            // Declare the format for [quote] layout
            $QuoteLayout = '<blockquote>$1</blockquote>';                     
            // Check for [quote] text
            $Text = preg_replace("/\[quote\](.+?)\[\/quote\]/is","$QuoteLayout", $Text);
         
            // Images
            // [img]pathtoimage[/img]
            $Text = preg_replace("/\[img\](.+?)\[\/img\]/", '<img src="$1">', $Text);
         
            // [img=widthxheight]image source[/img]
            $Text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.+?)\[\/img\]/", '<img src="$3" height="$2" width="$1">', $Text);
         
           return $Text;
      }