note 90459 added to function.readfile

To reduce the burden on the server, you might want to output "Etag" and/or "Last-Modified" on http response header. But there are some headers, which PHP itself outputs automatically, disturbing this. So I wrote this function with erasing these. If you guys know how to judge the return values of function "stat", in order to avoid using "is_file" or "is_readable" (or "is_dir"), please let me know or just write it here. If you don't have to do anything special on 404, "header('HTTP/1.x xxx xxxxx');" can be inside of the function. <?php $filename = '/foo/bar/myfeed.rss'; $http_stat_code = readfile_if_modified($filename, array('Content-Type: text/xml')); switch($http_stat_code) { case 404: header('HTTP/1.0 404 Not Found'); echo '<html><head></head><body><a href="http://example.com/">http://example.com/<a></body></html>'; exit; default: header('X-System-Url: http://example.com/', true, $http_stat_code); } function readfile_if_modified($filename, $http_header_additionals = array()) { if(!is_file($filename)) { // header('HTTP/1.0 404 Not Found'); return 404; } if(!is_readable($filename)) { // header('HTTP/1.0 403 Forbidden'); return 403; } $stat = @stat($filename); $etag = sprintf('%x-%x-%x', $stat['ino'], $stat['size'], $stat['mtime'] * 1000000); header('Expires: '); header('Cache-Control: '); header('Pragma: '); if(isset($_SERVER['HTTP_IF_NONE_MATCH']) && $_SERVER['HTTP_IF_NONE_MATCH'] == $etag) { header('Etag: "' . $etag . '"'); // header('HTTP/1.0 304 Not Modified'); return 304; } elseif(isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $stat['mtime']) { header('Last-Modified: ' . date('r', $stat['mtime'])); // header('HTTP/1.0 304 Not Modified'); return 304; } header('Last-Modified: ' . date('r', $stat['mtime'])); header('Etag: "' . $etag . '"'); header('Accept-Ranges: bytes'); header('Content-Length:' . $stat['size']); foreach($http_header_additionals as $header) { header($header); } if(@readfile($filename) === false) { // header('HTTP/1.0 500 Internal Server Error'); return 500; } else { // header('HTTP/1.0 200 OK'); return 200; } } ?> ---- Server IP: 61.195.146.164 Probable Submitter: 219.118.191.50 ---- Manual Page -- http://www.php.net/manual/en/function.readfile.php Edit -- https://master.php.net/note/edit/90459 Del: integrated -- https://master.php.net/note/delete/90459/integrated Del: useless -- https://master.php.net/note/delete/90459/useless Del: bad code -- https://master.php.net/note/delete/90459/bad+code Del: spam -- https://master.php.net/note/delete/90459/spam Del: non-english -- https://master.php.net/note/delete/90459/non-english Del: in docs -- https://master.php.net/note/delete/90459/in+docs Del: other reasons-- https://master.php.net/note/delete/90459 Reject -- https://master.php.net/note/reject/90459 Search -- https://master.php.net/manage/user-notes.php