How to Mimic Stack Overflow\'s Auto-Linking Behavior in PHP?

Mimicking Stack Overflow's Auto-Linking in PHP

Stack Overflow's auto-linking feature effortlessly converts bare URLs into clickable links, enhancing readability and user experience. This behavior has sparked curiosity among developers, leading to requests for a PHP implementation.

Regex Magic

The core of this functionality lies in a meticulously crafted regular expression pattern. The pattern identifies a wide range of URL formats, both with and without trailing slashes and protocols.

Customizable Output

This PHP auto-linking function allows for customization of the output. By modifying the provided callback function, you can tailor the display of the links, including the removal of the HTML title attribute if desired.

Input Text Transformation

Upon encountering a match, the function parses the URL components and transforms them into a concise, human-readable format. The function includes an ellipsis (...) at the end if the path segment exceeds a certain length. This ensures a visually appealing and informative output.

Example in Action

To witness the auto-linking magic in action, consider the following input text:

<code class="text">This is my text.  I wonder if you know about asking questions on StackOverflow:
 Check This out http://www.stackoverflow.com/questions/1925455/how-to-mimic-stackoverflow-auto-link-behavior

 Also, base_convert php function?
http://pt.php.net/manual/en/function.base-convert.php#52450

http://pt.php.net/manual/en/function.base-convert.php?wtf=hehe#52450</code>

Running the auto_link_text function on this input results in:

<code class="html">This is my text.  I wonder if you know about asking questions on StackOverflow:
 Check This out <a rel="nofollow" href="http://www.stackoverflow.com/questions/1925455/how-to-mimic-stackoverflow-auto-link-behavior">stackoverflow.com/questions/1925455/...</a>

 Also, base_convert php function?
<a rel="nofollow" href="http://pt.php.net/manual/en/function.base-convert.php#52450">pt.php.net/manual/en/...</a>

<a rel="nofollow" href="http://pt.php.net/manual/en/function.base-convert.php?wtf=hehe#52450">pt.php.net/manual/en/...</a></code>

As you can see, the URLs have been transformed into clickable links, mimicking the auto-linking behavior of Stack Overflow.

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