Pulls current weather icon from Yahoo and displays it with alpha transparency

wicon.php

<?php
$url="http://weather.yahoo.com/norway/oppland-fylke/gjovik-858964/"; //Yahoo weather URL for you location

$file_contents = file_get_contents($url); //Fetching the contents from the url
$divStart = '<div class="forecast-icon" style="background:url(' . "'"; //HTML before weather image
$strEnd = "'); _background-image/* */: none;"; //HTML after weather image

//Preparing for image url extraction via substr()
$start = strpos($file_contents, $divStart) + 50;
$end = strpos($file_contents, $strEnd);
$length = $end-$start;

$imagepath=substr($file_contents, $start , $length); //Pulls path to image
$image=imagecreatefrompng($imagepath); //Pulls image source into PHP
imagealphablending($image, true); //Enable alpha blending (important)
imagesavealpha($image, true); //Applies alpha to image.

header('Content-Type: image/png'); //Identifies itself as a PNG image
imagepng($image); //Outputs image contents
?>