Question

Possible Duplicate:
How do I auto convert an url into a hyper link in PHP?

Let’s say, I have an textfield on my website, where the user can enter anything he wants to.
If the user enters a url, I would like to add code to this url in the background. Therefor I would need logic in order to recognize the url.

Example
The user enters a text:

Please visit me at my website: http://www.mywebsite.org

I would like to change the code in the background to something like this:

Please visit me at my website: <a href="http://www.companywebsite.com/redirect.php?http://www.mywebsite.org">http://www.mywebsite.org</a>

How is it possible to change that link after the text has been submitted?

Answer 1

<?php

// The Regular Expression filter
$reg_exUrl = "/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";

// The Text you want to filter for urls
$text = "The text you want to filter goes here. http://google.com";

// Check if there is a url in the text
if(preg_match($reg_exUrl, $text, $url)) {

       // make the urls hyper links
       echo preg_replace($reg_exUrl, "<a href="{$url[0]}">{$url[0]}</a> ", $text);

} else {

       // if no urls in the text just return the text
       echo $text;

}
?>