Code evaluation (pull file from browser cache)

10 hour assignment. I am using a code to pull the cached files from the browser (primarily Internet Explorer). It's not working properly. I Want to see if anybody can get it working. The file is supposed to look at the temp folder for a specific file then use "output buffering" so that I may use the saved version of the file or use the cached file as a variable in my other php code here is the code: // check if the cache file already exists // and is less than 5 minutes old if (file_exists(’[login to view URL]’) && time() - filemtime(’[login to view URL]’) < 300) { // the output is already cached, so just // dump the file’s contents to the browser readfile(’[login to view URL]’); } else { // otherwise, the cache doesn’t exist yet // or is more than 5 minutes old, so it’s time // to re-generate the content // turn on output buffering so your code’s output // gets stored in the buffer instead of sent to the // browser ob_start(); // here you can place the existing PHP and HTML // you want to cache // now, write the output you captured in the buffer // into the cache file $fp = fopen(’[login to view URL]’, ‘w’); fwrite($fp, ob_get_contents()); fclose($fp); // and output the buffer’s contents to the // browser as well ob_end_flush();