PHP look for doogle image on Google web page

google_doodle_download.php

$ch = curl_init("http://www.google.it/") ;
curl_setopt ($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_HTTPGET, 1);
$str = curl_exec($ch);
curl_close($ch);

$str = substr($str,strpos(str_replace("\"","",$str),'id=logo')-100);
$str = substr($str,strpos($str,'<img '));
$str = substr($str,0,strpos($str,'>')+1);
$str = str_replace("\"","",$str);
$str = str_replace("'","",$str);
$str = substr($str,strpos($str,'src=')+4);
$str = substr($str,0,strpos($str,' '));

$str = "http://www.google.it" . $str;
echo "<textarea cols=80 rows=10>".$str."</textarea>";