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#14

[eluser]mvdg27[/eluser]
I'll take the risk of Phil changing his mind after all, and coming to hunt me down .. hehe Wink

Anyway, here is my latest version of the twitter function. I've added some functionality:

- timeout for retrieving the Twitter feed from twitter.com, so you can prevent your website from becoming too slow when Twitter is too busy
- parsing the Tweet text
- an option to force clearing the cache

Code:
function twitter_feed($username = '', $max = 5, $cache_time = 3600, $timeout = 1, $clear_cache = false) {

        // pattern replacement rules to process the tweet texts (by Phil Sturgeon)
        $patterns = array(
            // Detect URL's
            '|([a-z]{3,9}://[a-z0-9-_./?&+]*)|i' => '<a href="$0" target="_blank">$0</a>',
            
            // Detect Email
            '|[a-z0-9._%+-][email protected][a-z0-9.-]+.[a-z]{2,6}|i' => '<a href="mailto:$0">$0</a>',
            
            // Detect Twitter @usernames
            '|@([a-z0-9-_]+)|i' => '<a href="http://twitter.com/$1" target="_blank">$0</a>',
            
            // Detect Twitter #tags
            '|#([a-z0-9-_]+)|i' => '<a href="http://twitter.com/search?q=#$1" target="_blank">$0</a>'
        );
        
        // cache file and live file
        $cache_file = '/cache/twitter/'.$username.'.xml';
        $live_file = 'http://twitter.com/statuses/user_timeline/'.$username.'.xml';

        // clear cache
        if($clear_cache) unlink($cache_file);

        // check if a cache file exists        
        if(file_exists($cache_file)) {
            
            // is the cache file still valid?
            if(filemtime($cache_file) + $cache_time > mktime()) {
                // read the rss feed from the cache
                $rss_feed = file_get_contents($cache_file);
            }
            // if not valid anymore
            else {
                // try and get the live feed
                $context = stream_context_create(array('http' => array('timeout' => $timeout)));
                $rss_feed = @file_get_contents($live_file, 0, $context);
                // save rss feed in cache file if the rss feed was retrieved successfully
                if($rss_feed) file_put_contents($cache_file, $rss_feed);
                // else use the cached file instead
                else $rss_feed = file_get_contents($cache_file);                    
            }
        }
        // cache file doesn't exist
        else {
            // try and get the live feed
            $context = stream_context_create(array('http' => array('timeout' => $timeout)));
            $rss_feed = @file_get_contents($live_file, 0, $context);
            // save rss feed in cache file if the rss feed was retrieved successfully
            if($rss_feed) file_put_contents($cache_file, $rss_feed);
            // else failed to retrieve feed
            else $rss_feed = false;            
        }
        
        // Ok. We have an rss feed. Let's process it
        if($rss_feed) {
            // we use simplexml to create an object out of the rss feed
            $tweets = @simplexml_load_string($rss_feed);
            // simplexml couldn't process the rss feed properly
            if(!$tweets) {
                // we return an error
                $return = 'Twitter feed not found';
                // we clear the cache. No use for a cache file that can't be processed
                unlink($cache_file);
            }
            // yes. we have something to process
            else {
                // set our counter to '0'
                $i = 0;
                $return = array();
                // loop through the tweets
                foreach($tweets as $tweet) {
                    // check the counter
                    if($i >= $max) continue;
                    // add the tweet (text is being parsed)) to the return variable
                    $return[] = array(
                        'datetime' => $tweet->created_at,
                        'text' => preg_replace(array_keys($patterns), array_values($patterns), $tweet->text),
                        'source' => $tweet->source
                    );
                    // counter + 1
                    $i++;
                }
            }
        }
        // we ended up with no rss feed, return error
        else $return = 'Twitter feed not found';
        
        // return the result
        return $return;    
    }

Let me know what you think of the code, and how it works in a production environment.

Enjoy Smile

Michiel


Messages In This Thread
Show latest tweets - by El Forum - 10-03-2009, 01:11 PM
Show latest tweets - by El Forum - 10-03-2009, 02:00 PM
Show latest tweets - by El Forum - 10-03-2009, 02:05 PM
Show latest tweets - by El Forum - 10-03-2009, 04:33 PM
Show latest tweets - by El Forum - 10-04-2009, 05:14 AM
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Show latest tweets - by El Forum - 10-04-2009, 11:59 PM
Show latest tweets - by El Forum - 10-05-2009, 05:46 AM
Show latest tweets - by El Forum - 10-05-2009, 05:56 AM
Show latest tweets - by El Forum - 10-05-2009, 07:59 AM
Show latest tweets - by El Forum - 10-05-2009, 08:09 AM
Show latest tweets - by El Forum - 10-05-2009, 09:00 AM
Show latest tweets - by El Forum - 10-05-2009, 09:58 AM
Show latest tweets - by El Forum - 10-05-2009, 10:22 AM
Show latest tweets - by El Forum - 10-05-2009, 02:15 PM
Show latest tweets - by El Forum - 10-05-2009, 02:16 PM



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