- <?php
- /**
- * PHP-HTTP断点续传实现
- * @param string $path: 文件所在路径
- * @param string $file: 文件名
- * @return void
- */
- function download($path, $file) {
- $real = $path . '/' . $file;
- if (! file_exists ( $real )) {
- return false;
- }
- $size = filesize ( $real );
- $size2 = $size - 1;
- $range = 0;
- if (isset ( $_SERVER ['HTTP_RANGE'] )) {
- header ( 'HTTP /1.1 206 Partial Content' );
- $range = str_replace ( '=', '-', $_SERVER ['HTTP_RANGE'] );
- $range = explode ( '-', $range );
- $range = trim ( $range [1] );
- header ( 'Content-Length:' . $size );
- header ( 'Content-Range: bytes ' . $range . '-' . $size2 . '/' . $size );
- } else {
- header ( 'Content-Length:' . $size );
- header ( 'Content-Range: bytes 0-' . $size2 . '/' . $size );
- }
- header ( 'Accenpt-Ranges: bytes' );
- header ( 'application/octet-stream' );
- header ( "Cache-control: public" );
- header ( "Pragma: public" );
- //解决在IE中下载时中文乱码问题
- $ua = $_SERVER ['HTTP_USER_AGENT'];
- if (preg_match ( '/MSIE/', $ua )) {
- $ie_filename = str_replace ( '+', '%20', urlencode ( $file ) );
- header ( 'Content-Dispositon:attachment; filename=' . $ie_filename );
- } else {
- header ( 'Content-Dispositon:attachment; filename=' . $file );
- }
- $fp = fopen ( $real, 'rb+' );
- fseek ( $fp, $range );
- while ( ! feof ( $fp ) ) {
- set_time_limit ( 0 );
- print (fread ( $fp, 1024 )) ;
- flush ();
- ob_flush ();
- }
- fclose ( $fp );
- }
- /*End of PHP*/
- ob_start();
- $size = filesize($file_dir . $file_name);
- // 输入文件标签
- Header("Content-type: application/octet-stream");
- Header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
- Header("Content-length: " . $size);
- $encoded_filename = urlencode($down_name);
- $encoded_filename = str_replace("+", "%20", $encoded_filename);
- $ua = $_SERVER["HTTP_USER_AGENT"];
- // 处理下载的时候的文件名
- if (preg_match("/MSIE/", $ua)) {
- header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');
- } else if (preg_match("/Firefox/", $ua)) {
- header('Content-Disposition: attachment; filename*="utf8\'\'' . $down_name . '"');
- } else {
- header('Content-Disposition: attachment; filename="' . $down_name . '"');
- }
- $fp = fopen($file_dir . $file_name, "r"); // 打开文件
- if (isset($_SERVER['HTTP_RANGE']) && ($_SERVER['HTTP_RANGE'] != "") && preg_match("/^bytes=([0-9]+)-/i", $_SERVER['HTTP_RANGE'], $match) && ($match[1] < $size)) {
- $range = $match[1];
- fseek($fp, $range);
- header("HTTP/1.1 206 Partial Content");
- //header("Date: " . gmdate("D, d M Y H:i:s") . " GMT");
- header("Last-Modified: " . gmdate("D, d M Y H:i:s", filemtime($file_dir . $file_name)) . " GMT");
- header("Accept-Ranges: bytes");
- $rangesize = ($size - $range) > 0 ? ($size - $range) : 0;
- header("Content-Length:" . $rangesize);
- header("Content-Range: bytes " . $range . '-' . ($size - 1) . "/" . $size);
- // header("Connection: close" . "\n\n" );
- //header("Connection: close"." ");
- } else {
- header("Content-Length: " . (string) ($size));
- header("Accept-Ranges: bytes");
- $range = 0;
- header("Content-Range: bytes " . $range . '-' . ($size - 1) . "/" . $size);
- }
- fpassthru($fp);
- ob_end_flush();
- fclose($fp);
- exit;