I'm trying to mod my blog a little, I want to add a function that automaticly adds Wikipedia links.

So when i type [[wiki]RAM] It makes it <a href="http://en.wikipedia.org/wiki/RAM">RAM</a>

And maybe even support for different languages like

[[wiki:nl]RAM] for http://nl.wikipedia.org/wiki/RAM and
[[wiki:en]RAM] for http://en.wikipedia.org/wiki/RAM

I'm not really a hero with advanced string replacers , so any help is appreciated

BTW: I also noticed that wikipedia has _ as spaces in links, maybe strip those out and make them normal spaces in the part that shows on the page.

$input = ereg_replace("\[\[wiki\]([[:alpha:]]+)\]", "<a href=\"http://www.wikipedia.org/wiki/\\1\">\\1</a>", $input);

That's your first question. With languages it is:

$input = ereg_replace("\[\[wiki:([[:alpha:]]+)\]([[:alpha:]]+)\]", "<a href=\"http://\\1.wikipedia.org/wiki/\\2\">\\2</a>", $input);

Doesn't work with me

Some how it doesn't work with _ and there are _ in a lot of links

quote:

---

Originally posted by Ezra
I'm trying to mod my blog a little, I want to add a function that automaticly adds Wikipedia links.

So when i type [[wiki]RAM] It makes it <a href="http://en.wikipedia.org/wiki/RAM">RAM</a>

---

code:

---

$string = preg_replace("/\[\[wiki\](.+)\]/i", '<a href="http://en.wikipedia.org/wiki/$1">$1</a>', $string);

---

quote:

---

And maybe even support for different languages like

[[wiki:nl]RAM] for http://nl.wikipedia.org/wiki/RAM and
[[wiki:en]RAM] for http://en.wikipedia.org/wiki/RAM

I'm not really a hero with advanced string replacers , so any help is appreciated

---

code:

---

$string = preg_replace("/\[\[wiki:([a-z]{2})\](.+)\]/i", '<a href="http://$1.wikipedia.org/wiki/$2">$2</a>', $string);

---

Edit 2: @ WDZ => preg_ > ereg/i

Wonderfull preg_replace works with _'s

quote:

---

Originally posted by Ezra
Wonderfull preg_replace works with _'s

---

Oh, is there also any way to remove the _ from the visible part of the link?

Err, unless you encode it which makes it %05 or something, _ look better. =p

No, that's not what I mean

I mean that it's like this

[[wiki:nl]Random_acces_memory] becomes:

<a href="http://nl.wiki.org/wiki/Random_acces_memory">Random Acces Memory</a>

code:

---

function wiki_link($input) {
   $i = 0;
   $output = "";
   while($i < strlen($input)) {
      $searchfor = "[[wiki";
      if(substr($input, $i, strlen($searchfor)) == $searchfor) {
         if($input{$i+strlen($searchfor)} == ":") {
            $next = strpos($input, "]", $i);
            $lang = substr($input, $i+strlen($searchfor)+1, $next - ($i+strlen($searchfor)) - 1);
            $next2 = strpos($input, "]", $next + 1);
            $thestr = substr($input, $next + 1, $next2 - $next - 1);
            $output .= "<a href=\"http://" . $lang . ".wikipedia.org/wiki/" . $thestr . "\">" . str_replace("_", " ", $thestr) . "</a>";
            $i = $next2 + 1;
         }
         elseif($input{$i+strlen($searchfor)} == "]") {
            $next = strpos($input, "]", $i+strlen($searchfor)+1);
            $thestr = substr($input, $i+strlen($searchfor) + 1, $next - ($i+strlen($searchfor)) - 1);
            $output .= "<a href=\"http://www.wikipedia.org/wiki/" . $thestr . "\">" . str_replace("_", " ", $thestr) . "</a>";
            $i = $next + 1;
         }
         else {
            $output .= $searchfor;
            $i += strlen($searchfor);
         }
      }
      else {
         $output .= $input{$i};
         $i++;
      }
   }
   return $output;
}

---

It's great , fantastic, I never could have made that myself...

If I understand correct, If I use [[wiki]blaa] it goes to the english version?

quote:

---

Originally posted by J-Thread
function wiki_link($input) {
......

---

quote:

---

Originally posted by PHP Manual
If this modifier is set, preg_replace() does normal substitution of backreferences in the replacement string, evaluates it as PHP code, and uses the result for replacing the search string.

---

My PERL Regex aren't that good... At least I'm sure the replacement of _ isn't possible with a simple regular expression. How would you do that with your preg function?

By the way, Leo's solution with the preg_replace does work, but only if there is one link to replace. Try this:

code:

---

$input = "[[wiki:nl]RAM] and [[wiki:en]Does_this_work]";

---

code:

---

<a href="http://nl.wikipedia.org/wiki/RAM] and [[wiki:en]Does_this_work">RAM] and [[wiki:en]Does_this_work</a>

---

code:

---

$string = preg_replace('/\[\[wiki(?:\:|)([a-zA-Z]+|)\]([a-zA-z0-9]+)\]/e', 'defL("$1","$2")',$string);

function defL($lang,$title){
if($lang=='')$lang='en';
return "<a href='http://$lang.wikipedia.org/wiki/$title'>$title</a>";
}

---

code:

---

$string = preg_replace('/\[\[wiki(?:\)([a-zA-Z]+|)\]([a-zA-z0-9]+)\]/e', 'defL("$1","$2")',$string);

function defL($lang,$title){
if($lang=='')$lang='en';
return "<a href='http://$lang.wikipedia.org/wiki/$title'>" . str_replace("_", " ", $title) . "</a>";
}

---

quote:

---

Originally posted by J-Thread

code:

---

$string = preg_replace('/\[\[wiki(?:\:|)([a-zA-Z]+|)\]([a-zA-z0-9]+)\]/e', 'defL("$1","$2")',$string);

function defL($lang,$title){
if($lang=='')$lang='en';
return "<a href='http://$lang.wikipedia.org/wiki/$title'>" . str_replace("_", " ", $title) . "</a>";
}

---

That also replaces the _ to spaces. Ok I didn't knew something like this did exist, really interesting. This is the final one, and is the best option I think.

Maybe replace $lang='en' by $lang='www', so people are sended to the default language of wikipedia, and maybe to there own language if wikipedia introduces a language check...

---

code:

---

$string = preg_replace('/\[\[wiki(?:\:|)([a-zA-Z]+|)\]([a-zA-z0-9_]+)\]/e', 'defL("$1","$2")',$string);

function defL($lang,$title){
if($lang=='')$lang='en';
$title1 = str_replace("_", " ", $title);
return "<a href='http://$lang.wikipedia.org/wiki/$title'>$title1</a>";
}

---

quote:

---

Originally posted by WDZ

quote:

---

Originally posted by J-Thread
function wiki_link($input) {
......

---

Holy crap, what was that?

I would have just used the 'e' modifier with preg_replace().

http://php.net/manual/en/reference.pcre.pattern.modifiers.php

quote:

---

Originally posted by PHP Manual
If this modifier is set, preg_replace() does normal substitution of backreferences in the replacement string, evaluates it as PHP code, and uses the result for replacing the search string.

---

---

quote:

---

Originally posted by -dt-

code:

---

$string = preg_replace('/\[\[wiki(?:\)([a-zA-Z]+|)\]([a-zA-z0-9_]+)\]/e', 'defL("$1","$2")',$string);

    function defL($lang,$title){
    if($lang=='')$lang='en';
    $title1 = str_replace("_", " ", $title);
    return '<a href="http://'.$lang.'.wikipedia.org/wiki/'.$title.'">'.$title1.'</a>';
    }

---

---

That isn't an error is it? I'd rather prefer:

code:

---

return "<a href=\"http://" . $lang . ".wikipedia.org/wiki/" . $title . "\">" . $title1 . "</a>";

---

quote:

---

Originally posted by Ezra

quote:

---

Originally posted by -dt-

code:

---

$string = preg_replace('/\[\[wiki(?:\)([a-zA-Z]+|)\]([a-zA-z0-9_]+)\]/e', 'defL("$1","$2")',$string);

    function defL($lang,$title){
    if($lang=='')$lang='en';
    $title1 = str_replace("_", " ", $title);
    return '<a href="http://'.$lang.'.wikipedia.org/wiki/'.$title.'">'.$title1.'</a>';
    }

---

---

Found a little error, fixed it

Instead of using the parts defined in the tag it made a link like this:
<a href="$lang.wikipedia.org/wiki/$title">$title1</a>

---

code:

---

$string = preg_replace('/\[\[wiki(?:\:|)([a-zA-Z]+|)\]([a-zA-z0-9_]+)\]/e', 'defL("$1","$2")',$string);


function defL($lang,$title){
if($lang=='')$lang='en';
$title1 = str_replace("_", " ", $title);
return "<a href='http://$lang.wikipedia.org/wiki/$title'>$title1</a>";
}

---

Ah, that's why , I changed the " for ' .

But it works now