Instapaper Feed for KirbyText

kirbytext.extended.php

<?php 

/*

AUTHOR: 
Azhar Chougle (azmataz.com)

DESCRIPTION:
This KirbyText extension will fetch your Instapaper Likes, choose a random one, and output a link. 
It won't output if the feed is invalid, and will try to read it from cache if it is unavailable. 
The cURL request is also set to timeout after 1 second so that your page load doesn't stall because of a fetch gone awry.

USAGE:
(instapaper: http://www.instapaper.com/starred/rss/********)

OUTPUT:
Recently he enjoyed reading (link)

*/

class kirbytextExtended extends kirbytext {
  
  function __construct($text, $markdown=true) {
    
    parent::__construct($text, $markdown);
    
    /*   

    // define custom tags
    $this->addTags('mynewtag', 'anothertag');
    
    // define custom attributes
    $this->addAttributes('mynewattribute', 'anotherattribute');    
    
    */

    $this->addTags('instapaper');
                
  }  

  /*
  
  // define a function for each new tag you specify  
  
  function mynewtag($params) {
    // do something with the passed params here.
  }
  
  */

  function instapaper($params) {

        $url = $params["instapaper"];

        // If the cache has expired, get the new feed.
        if (!$feed = cache::get('instapaper', false, 43200)) {
          // Set up fetch
          $ch = curl_init(); 
          $options = array(
                CURLOPT_URL => $url,
                CURLOPT_HEADER => false,
                CURLOPT_NOBODY => false,
                CURLOPT_TIMEOUT => 1,
                CURLOPT_RETURNTRANSFER => true,
                );

          // Set options
          curl_setopt_array($ch, $options);

          // Do it
          $xml = curl_exec($ch); 
          curl_close($ch); 

          // Parse response
          $feed = x::parse($xml);

          // Check the parse. 
          if (!$feed) {
            // Parse failed, attempt to load from cache.
            if (!$feed = cache::get('instapaper')) {
              return false;
            }
          } else {
            // Cache the feed
            cache::set('instapaper', $feed);
          }

        }

        $article = $feed["channel"]["item"][array_rand($feed["channel"]["item"])];

        // Final safety check and output.
        if (url::valid($article["link"])) {
          return "Recently he enjoyed reading " . str::link($article["link"], str::short($article["title"], 45));
        }

  }
  
}

?>