Wordpress_Short_Code.php

<?php
/**
 * Plugin Name: Twitter Shower
 * Plugin URI: http://esgy.eu
 * Description: Simple shortcode
 * Version: 1.0
 * Author: Sorin Gitlan
 * Author URI: http://esgy.eu
 */

add_shortcode('twitter', function($atts, $content){
    
    $atts = shortcode_atts( 
        array(
            'username' => 'esgy_eu',
            'content' => !empty($content) ? $content : 'Follow me on Twitter!',
            'show_tweets' => true,
            'tweet_reset_time' => 10,
            'num_tweets' => 5
        ), $atts 
    );
    extract($atts);

    if($show_tweets){
        $tweets = fetch_tweets($num_tweets, $username, $tweet_reset_time);
    }
    
    return $tweets . '<p><a href="http://twitter.com/'. $username .'" target="_blank">'. $content .'</a></p>';
});

function fetch_tweets($num_tweets, $username, $tweet_reset_time){
    
    global $id;
    $recent_tweets = get_post_meta( $id, 'jw_recent_tweets');
    reset_data($recent_tweets, $tweet_reset_time);

    // if no cache fetch new tweets
    if(empty($recent_tweets)){

        $tweets = curl('https://api.twitter.com/1/statuses/user_timeline.json?include_entities=true&include_rts=1&screen_name=@'.$username.'&count='. $num_tweets .'&published_when=1');

        //echo '<pre>';
        //print_r(json_decode($tweets));
        //echo '</pre>';
        
        $data = array();

        foreach (json_decode($tweets) as $tweet) {
            $data[] =  $tweet->text."<br>";
        }

        $recent_tweets = array( (int)date( 'i', time() ) );
        $recent_tweets[] = '<ul class="jw_tweets"><li>'. implode('</li><li>', $data) . '</li></ul>';

        cache($recent_tweets);

    }

    return isset($recent_tweets[0][1]) ? $recent_tweets[0][1] : $recent_tweets[1];
}

function curl($url){

        $curl = curl_init($url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
        return curl_exec($curl);
        curl_close($curl);

}

function cache($recent_tweets){
    // [0] = current minute
    // [1] = tweet html fragment
    
    global $id;
    add_post_meta( $id, 'jw_recent_tweets', $recent_tweets, true );

}

function reset_data($recent_tweets, $tweet_reset_time){
    global $id;

    if( isset($recent_tweets[0][0]) ){
        $delay = $recent_tweets[0][0] + (int)$tweet_reset_time;

        if($delay >= 60) $delay -= 60;

        if($delay <= (int)date( 'i', time() )){
            delete_post_meta( $id, 'jw_recent_tweets');
        }

    }

}