I am using cURL to get an XML feed and save it into an XML file, like so
if (file_exists($filename) && (filemtime($filename) > time() - 30)) { // load cached XML from file $output = simplexml_load_file($filename); return $output;} else { // Initiate the curl session $ch = curl_init(); // Set the URL curl_setopt($ch, CURLOPT_URL, $url); // Removes the headers from the output curl_setopt($ch, CURLOPT_HEADER, 0); // Callback to get custom headers curl_setopt($ch, CURLOPT_HEADERFUNCTION, array(&$this,'readHeader')); // Return the output instead of displaying it directly curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // Execute the curl session $output = curl_exec($ch); // Return headers $headers = curl_getinfo($ch); // Merge headers into one array $this->response_meta_info = array_merge($headers, $this->response_meta_info); // Close the curl session curl_close($ch); // Cache feed file_put_contents($filename, $output); // XML to object $output = simplexml_load_string($output); // Return the output as an array return $output;}It returns the following http headers
Array( [url] => http://example.com [content_type] => text/xml [http_code] => 200 [header_size] => 425 [request_size] => 108 [filetime] => -1 [ssl_verify_result] => 0 [redirect_count] => 0 [total_time] => 0.677605 [namelookup_time] => 0.181104 [connect_time] => 0.342955 [pretransfer_time] => 0.343036 [size_upload] => 0 [size_download] => 6579 [speed_download] => 9709 [speed_upload] => 0 [download_content_length] => 6579 [upload_content_length] => 0 [starttransfer_time] => 0.515733 [redirect_time] => 0 [expires] => Wed, 23 Nov 2011 15:49:24 GMT)I want to use the [expires] => Wed, 23 Nov 2011 15:49:24 GMT header instead of using the time now minus 30 seconds bit of this if statement (file_exists($filename) && (filemtime($filename) > time() - 30)) { as then it will only update the cache when it needs to.
But I can't work out how to do this.
