[URL] tags for guestbooks in PHP

FraXTC

Heya all!

Been a while , but I'm up to something again 🙂 I want to make a simple weblog like thingy, and I wanted to use the standard [ url ] [ /url ] tags. I want to do it exactly like it is done in these boards ==> http://www.blablabla.com

I tried to check older questions, but I can't seem to find the answer there, tried Google, no succes either, so now I'm asking you 🙂

Thankx in advance 🙂

pyro

Try something like this, which will work for URLs that are either like this, where you can specify the text for the url

[url=http://www.infinitypages.com]Infinity Web Design[/url]

or like this, where it just uses the link text as the display text

[url]http://www.infinitypages.com[/url]

<?PHP
$message = "&#91;url=http://www.infinitypages.com]Infinity Web Design[/url] or &#91;url]http://www.infinitypages.com[/url]";
$message = preg_replace("/\[url\](.*?)\[\/url\]/","<a href=\"\\1\">\\1</a>",$message);
$message = preg_replace("/\[url=(.*?)\](.*?)\[\/url\]/","<a href=\"\\1\">\\2</a>",$message);
echo $message;
?>

FraXTC

Thankx for that!

preg_replace... never heard of it.... I can't quite understand the slashes though... I know \ is used to tell PHP you literally mean to display a " and not as an exnding of the echo (or other command), but do you also need it when using []?? ... Oh wait a sec... Ofcourse $POST['blabla'] <=== Uses the [... So that explains the \

... (.?) is the stuff the preg_replace shouldn't meddle with, and \1 is the same as (.?), weird way of defining.. But heck, if it works.. 😃

On thing though: the $message starts with

"/\[url=......"

resulting in php as...

"/\[url=......."

What's the use of the / in the beginning??

seby

try this.

$message = preg_replace("/\[url\](.*?)\[\/url\]/si", "<a href='http://\\1'>http://\\1</a>", $message);
$message = preg_replace("/\[url=(.*?)\](.*?)\[\/url\]/si", "<a href='\\1'>\\2</a>", $message);

seby

err. dont use that code i post above, the forum is stripping some of the slashes, use the attached txt file.

pyro

preg_replace is a Perl compatable regexp: http://us2.php.net/manual/en/ref.pcre.php

Next, the \ are needed before the [ and ] because in PCRE, those are used to indicate a character set, and we want to use them as their literal values.

(.*?) means to match any character, but to be ungreedy (ie. stop when it finds the next bit we are searching for), and the \1 is the same as $1 in that it just references what was found in our subpatteren -- the url, in that case.

The / at the beginning (and end) of the regexp is the delimiter for the regexp.

Also, seby, I'm not sure why you think your modification is better... I can somewhat see the case insensativity, but why the inclusion of new lines with the dot metacharacter (the s)?