How to change color of link if url destination page does not exist

Question

I am making a simple wiki-style site. I have some text in database and want to make links with [link] tag.

$text = preg_replace('@\[(.*) (.*)\]@', '<a href="\\1" >\\2</a>', $text);

Now I want to change color of the link if the destination page does not exist. How it can be done?

If I insert php code in preg_replace like this:

$text = preg_replace('@[(.*) (.*)]@', '<a href="\\1" class="<?php Wiki::urlchecker($\\1) ?>">\\2</a>', $text); 


it doesnt work, generates:
<a href="link" class="<?php Wiki::urlchecker($link) ?>">Name</a>

Welcome to Stack Overflow! StackOverflow is not the proper place for this question. We do not write your code for you. You need to do your own coding and if you aren't sure why something is not working as expected, post the code with an explanation of what you were expecting it to do, and what it is actually doing including all error messages. See [about StackOverflow](http://stackoverflow.com/about). — Lightness Races in Orbit, Feb 23 '13 at 18:48

score 2 · Answer 1 · edited May 23 '17 at 12:12

2

Use get_headers to check whether it exists, then use logic to color it with HTML.

This question will show you how to check if the URL exists.

This quetsion will show you how to change the color of a link.

edited May 23 '17 at 12:12

Community

1
1

answered Feb 23 '13 at 18:47

Kermit

33,827
13
85
121

So.. "use logic". Good answer! – Lightness Races in Orbit Feb 23 '13 at 18:49
@LightnessRacesinOrbit I updated with some more. – Kermit Feb 23 '13 at 18:50
You updated with links. But links themselves do not contain information, they simply link to more information. Links are not answers. Please _quote_ the relevant passages of any pertinent information found behind those links. – Lightness Races in Orbit Feb 23 '13 at 18:56
@LightnessRacesinOrbit My answer will contain the same level of effort as the question. – Kermit Feb 23 '13 at 18:56
Well I'm sorry to hear that you have a completely incorrect view of how this website works. -1 from me. – Lightness Races in Orbit Feb 23 '13 at 18:57
@LightnessRacesinOrbit Yeah, no worries. – Kermit Feb 23 '13 at 18:57
I know how to change color of link and how to check url, but I dont undrestand how to apply it to generated links. If I insert php code in preg_replace like this: $text = preg_replace('@\[(.*) (.*)\]@', '>\\2', $text); it doesnt work – briancheg Feb 23 '13 at 19:09
What is generating the link? – Kermit Feb 23 '13 at 19:11
generates Football – briancheg Feb 23 '13 at 19:12
@AarolamaBluenk getText()) ?> (symfony framework) – briancheg Feb 23 '13 at 19:14
So you want to change the class in the CSS. – Kermit Feb 23 '13 at 19:15
it doen't matter how to change color, matters how to apply rule to generated links. Links are stored in database as [link name] – briancheg Feb 23 '13 at 19:55

How to change color of link if url destination page does not exist

1 Answers1