Dynamically display twitter display image of a user

<?php
/*
 * Please do not remove author's information.
 * Created by Sachin Khosla
 * URL : http://www.digimantra.com
 * Date : August 17,2009
 *
 */
 
class twitterImage
{
  var $user='';
  var $image='';
  var $displayName='';
  var $url='';
  var $format='json';
  var $requestURL='http://twitter.com/users/show/';
  var $imageNotFound=''; //any generic image/avatar. It will display when the twitter user is invalid
  var $noUser=true;
 
  function __construct($user)
  {
    $this->user=$user;
    $this->__init();
 
  }
  /*
   * fetches user info from twitter
   * and populates the related vars
   */
  private function __init()
  {
    $data=json_decode($this->get_data($this->requestURL.$this->user.'.'.$this->format)); //gets the data in json format and decodes it
    if(strlen($data->error)<=0) //check if the twitter profile is valid
 
    {
      $this->image=$data->profile_image_url;
      $this->displayName=$data->name;
      $this->url=(strlen($data->url)<=0)?'http://twitter.com/'.$this->user:$data->url;
      $this->location=$data->location;
    }
    else
    {
      $this->image=$this->imageNotFound;
    }
 
 
  }
  /* creates image tag
   * @params
   * passing linked true -- will return an image which will link to the user's url defined on twitter profile
   * passing display true -- will render the image, else return
   */
  function profile_image($linked=false,$display=false)
  {
    $img="<img src='$this->image' border='0' alt='$this->displayName' />";
    $linkedImg="<a href='$this->url' rel='nofollow' title='$this->displayName'>$img</a>";
    if(!$linked && !$display) //the default case
      return $img;
 
    if($linked && $display)
      echo $linkedImg;
 
    if($linked && !$display)
      return $linkedImg;
 
    if($display && !$linked)
      echo $img;
 
 
  }
  /* gets the data from a URL */
 
  private function get_data($url)
  {
    $ch = curl_init();
    $timeout = 5;
    curl_setopt($ch,CURLOPT_URL,$url);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
    curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);
    $data = curl_exec($ch);
    curl_close($ch);
    return $data;
  }
 
}
 
/* Example on how to use this class*/
//require_once('twitterImage.php') you will require this line if you are saving the above class in a different file
 
//the two lines are enough to display an image off the twitter
 
//$t=new twitterImage('digimantra'); //pass the twitter username
//$t->profile_image(true,true);  //this will render a linked image
 
/* More info about the params of profile_image function
 * true,true -- will render a linked image
 * true,false -- will return a linked image, will not render
 * false,true -- will render an image without link
 * false,false (or blank) -- will return an image, will not render
 */
?>

require_once('twitterImage.php')  //include the above class
$t=new twitterImage('digimantra'); //create instance of the class and pass the username
$t->profile_image(true,true); //display a linked image