<?php 

require 'RemoteImageInfo.php';

$uri = "http://farm9.staticflickr.com/8151/7357346052_54b8944f23_b.jpg";

// loading image into constructor
$image = new RemoteImageInfo($uri);
list($width, $height) = $image->getSize();
echo "dimensions: " . $width . "x" . $height;

// or, create an instance and use the 'load' method
$image = new RemoteImageInfo();
$image->load($uri);
$type = $image->getType();
echo "filetype: " . $type;