bbcode

function bbcode($text)
{
  $text = nl2br(addslashes($text));
 
  $text = str_replace("[b]", "<b>", $text);
  $text = str_replace("[/b]", "</b>", $text);

  $text = str_replace("[u]", "<u>", $text);
  $text = str_replace("[/u]", "</u>", $text);

  $text = str_replace("[i]", "<i>", $text);
  $text = str_replace("[/i]", "</i>", $text);
 
  $text = str_replace("[center]", "<center>", $text);
  $text = str_replace("[/center]", "</center>", $text);
 
  $text = str_replace("  ", "&nbsp;&nbsp;", $text);
 
  $text = str_replace(':)','<img src="http://www.mapping-area.com/images/smiley/smile.gif" alt="" style="border:0"/>',$text);
  $text = str_replace(';)','<img src="http://www.mapping-area.com/images/smiley/hehe.gif" alt="" style="border:0"/>',$text);
  $text = str_replace(':P','<img src="http://www.mapping-area.com/images/smiley/langue.gif" alt="" style="border:0"/>',$text);
  $text = str_replace(':D','<img src="http://www.mapping-area.com/images/smiley/bigrin.gif" alt="" style="border:0"/>',$text);
  $text = str_replace(':o','<img src="http://www.mapping-area.com/images/smiley/bouh.gif" alt="" style="border:0"/>',$text);
  $text = str_replace('lol','<img src="http://loka.forumactif.com/images/smiles/lol!.gif" alt="" style="border:0"/>',$text);
  $text = str_replace('boulet!','<img src="http://loka.forumactif.com/images/smiles/boulet.gif" alt="" style="border:0"/>',$text);
  $text = str_replace(':\'(','<img src="http://loka.forumactif.com/images/smiles/icon_sad.gif" alt="" style="border:0"/>',$text);
  $text = str_replace(':evil:','<img src="http://sitebas.free.fr/forum/images/smiles/icon_evil.gif" alt="" style="border:0"/>',$text);

  $patterns = array();
  $replacements = array();

  $patterns[] = "#\[img\](.*?)\[/img\]#si";
  $replacements[] = "<img src=\"\\1\" border=\"0\" />";

  $patterns[] = "#\[url\]([a-z0-9]+?://){1}([\w\-]+\.([\w\-]+\.)*[\w]+(:[0-9]+)?(/[^ \"\n\r\t<]*)?)\[/url\]#is";
  $replacements[] = "<a href=\"\1\2\" target=\"_blank\" class=\"postlink\">\1\2</a>";

  $patterns[] = "#\[url\]((www|ftp)\.([\w\-]+\.)*[\w]+(:[0-9]+)?(/[^ \"\n\r\t<]*?)?)\[/url\]#si";
  $replacements[] = "<a href=\"http://\\1\" target=\"_blank\" class=\"postlink\">\\1</a>";

  $patterns[] = "#\[url=([a-z0-9]+://)([\w\-]+\.([\w\-]+\.)*[\w]+(:[0-9]+)?(/[^ \"\n\r\t<]*?)?)\](.*?)\[/url\]#si";
  $replacements[] = "<a href=\"\\1\\2\">\\6</a>";

  $patterns[] = "#\[url=(([\w\-]+\.)*?[\w]+(:[0-9]+)?(/[^ \"\n\r\t<]*)?)\](.*?)\[/url\]#si";
  $replacements[] = "<a href=\"http://\\1\">\\5</a>";

  $patterns[] = "#\[email\]([a-z0-9\-_.]+?@[\w\-]+\.([\w\-\.]+\.)?[\w]+)\[/email\]#si";
  $replacements[] = "<a href=\"mailto:\\1\">\\1</A>";
 
  return preg_replace($patterns, $replacements, $text);
}