note 41580 deleted from function.file-exists by aidan

Note Submitter: cvictor at pchome dot com dot tw ---- <?php /** * Exam if a remote file or folder exists * * This function is adopted from setec's version. * + What's new: * Error code with descriptive string. * More accurate status code handling. * Redirection tracing supported. * * @retval true resource exists * @retval false resource doesn't exist * @retval "1 Invalid URL host" * @retval "2 Unable to connect to remote host" * @retval "3 Status Code not supported: {STATUS_CODE REASON}" */ function remote_file_exists($url) { $head = ''; $url_p = parse_url ($url); if (isset ($url_p['host'])) { $host = $url_p['host']; } else { return '1 Invalid URL host'; } if (isset ($url_p['path'])) { $path = $url_p['path']; } else { $path = ''; } $fp = fsockopen ($host, 80, $errno, $errstr, 20); if (!$fp) { return '2 Unable to connect to remote host'; } else { $parse = parse_url($url); $host = $parse['host']; fputs($fp, 'HEAD '.$url." HTTP/1.1\r\n"); fputs($fp, 'HOST: '.$host."\r\n"); fputs($fp, "Connection: close\r\n\r\n"); $headers = ''; while (!feof ($fp)) { $headers .= fgets ($fp, 128); } } fclose ($fp); // for debug //echo nl2br($headers); $arr_headers = explode("\n", $headers); if (isset ($arr_headers[0])) { if(strpos ($arr_headers[0], '200') !== false) { return true; } if( (strpos ($arr_headers[0], '404') !== false) || (strpos ($arr_headers[0], '410') !== false)) { return false; } if( (strpos ($arr_headers[0], '301') !== false) || (strpos ($arr_headers[0], '302') !== false)) { preg_match("/Location:\s*(.+)\r/i", $headers, $matches); if(!isset($matches[1])) return false; $nextloc = $matches[1]; return remote_file_exists($nextloc); } } preg_match('/HTTP.*(\d\d\d.*)\r/i', $headers, $matches); return '3 Status Code not supported'. (isset($matches[1])?": $matches[1]":''); } // sample code $urls = Array(); $urls[] = "http://google.com";//ok, folder $urls[] = "http://google/";//wrong host $urls[] = "http://ntuee.org/camp";//redirect 302 $urls[] = "http://ntuee.org/camp/a/";//redirect to non-existing dest $urls[] = "http://www.google.com/images/hp0.gif";//ok, file $urls[] = "http://www.google.com/images/hp00.gif";//non-existing file $urls[] = "https://download.cc.ntu.edu.tw/ssl/index.php";//auth 403 foreach($urls as $url) { echo "<b>$url</b><br />"; $ret = remote_file_exists($url); if ($ret===true) { echo "file exists!"; } elseif ($ret===false) { echo "file doesn't exist!"; } else { echo "error code: ".$ret; } print "<br />"; }