função bbcode completa e ótima

ta ai simples e eficaz, tem quase tudoque tem aqui no fórum do imasters :)

<?phpfunction bbcode($string){	$patterns = array('`\[b\](.+?)\[/b\]`is',	'`\[i\](.+?)\[/i\]`is',	'`\[u\](.+?)\[/u\]`is',	'`\[color=#([0-9a-fA-F]{6})](.+?)\[/color]`is',	'`\[email\](.+?)\[/email\]`is',	'`\[img\](.+?)\[/img\]`is',	'`\[url=([a-z0-9]+://)([\w\-]+\.([\w\-]+\.)*[\w]+(:[0-9]+)?(/[^ \"\n\r\t<]*?)?)\](.*?)\[/url\]`si',	'`\[url\]([a-z0-9]+?://){1}([\w\-]+\.([\w\-]+\.)*[\w]+(:[0-9]+)?(/[^ \"\n\r\t<]*)?)\[/url\]`si',	'`\[url\]((www|ftp)\.([\w\-]+\.)*[\w]+(:[0-9]+)?(/[^ \"\n\r\t<]*?)?)\[/url\]`si',	'`\[quote\](.+?)\[/quote\]`is',	'`\[code\](.+?)\[/code\]`is',	'`\[size=([1-6]+)\](.+?)\[/size\]`is');	$replaces = array('<span style="font-weight:bold">\\1</span>',	'<span style="font-style:italic">\\1</span>',	'<span style="text-decoration:underline">\\1</span>',	'<span style="color:#\1;">\2</span>',	'<a href="mailto:\1">\1</a>',	'<img src="\1" style="border:0px;" />',	'<a href="\1\2" target="_blank">\6</a>',	'<a href="\1\2" target="_blank">\1\2</a>',	'<a href="http://\1" target="_blank">\1</a>',	'<backquote>\1</backquote>',	'<code>\1</code>',	'<h\1>\2</h\1>'); $prev_string = NULL;	while($prev_string != $string){ $prev_string = $string; $string = preg_replace($patterns, $replaces, $string);	} return $string;}echo bbcode("[[b]serginho_the_best[/b]](http://www.serginhothebest.cjb.net/)"); //como usar?>

visite: http://www.serginhothebest.cjb.net