PHP CURL - Problems storing and using cookies when scraping

[zorro]

I've been trying to write a script that retrieves Google trends results for a given keyword. Please note im not trying to do anything malicious I just want to be able to automate this process and run it a few times every day.After investigating the Google trends page I discovered that the information is available using the following URL:http://www.google.com/trends/trendsReport?hl=en-GB&q=keyword&cmpt=q&content=1You can request that information mutliple times with no issues from a browser, but if you try with "privacy mode" after 4 or 5 requests the following is displayed:\[quote\] An error has been detected You have reached your quota limit. Please try again later.\[/quote\]This makes me think that cookies are required. So I have written my script as follows:\[code\]$cookiefile = $siteurl . '/wp-content/plugins/' . basename(dirname(__FILE__)) . '/cookies.txt';$url = 'http://www.google.com/trends/trendsReport?hl=en-GB&q=keyword&cmpt=q&content=1'; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_COOKIEJAR, $cookiefile);curl_setopt($ch, CURLOPT_COOKIEFILE, $cookiefile);curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.8) Gecko/2009032609 Firefox/3.0.8');curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);$x='error';while (trim($x) != '' ){ $html=curl_exec($ch); $x=curl_error($ch);}echo "test cookiefile contents = ".file_get_contents($cookiefile)."<br />";echo $html;\[/code\]However I just can't get anything written to my cookies file. So I keep on getting the error message. Can anyone see where I'm going wrong with this?