PHP下载大文件

项目中有个700M左右的大文件,须要下载到本地电脑上,在网上找了段代码,以下:

 1 <?php  2             $realname = "xxx.pdf";  3             $filename = "xxx.pdf";  4             set_time_limit(0);  5             $filesize = filesize($realname);  6             header('Content-Description: File Transfer');  7             header('Content-Type: application/octet-stream');  8             header('Content-Transfer-Encoding: binary');  9             header('Accept-Ranges: bytes'); 10             header('Expires: 0'); 11             header('Cache-Control: must-revalidate'); 12             header('Pragma: public'); 13             header('Content-Length: ' . $filesize); 14             header('Content-Disposition: attachment; filename=' . $filename); 15 
16             // 打开文件
17             $fp = fopen($realname, 'rb'); 18             // 设置指针位置
19             fseek($fp, 0); 20 
21             // 开启缓冲区
22             ob_start(); 23             // 分段读取文件
24             while (!feof($fp)) { 25                 $chunk_size = 1024 * 8; // 8kb
26                 echo fread($fp, $chunk_size); 27                 ob_flush(); // 刷新PHP缓冲区到Web服务器
28                 flush(); // 刷新Web服务器缓冲区到浏览器
29                 sleep(1); // 每1秒 下载 8 KB
30  } 31             // 关闭缓冲区
32             ob_end_clean(); 33 
34             fclose($fp);

完美下载!可是当部署到线上时,出现了问题:

说明:测试环境为http,线上环境为https

继续google....,找到以下代码:

<?php $realname = "xxx.pdf"; $filename = "xxx.pdf"; set_time_limit(0); $filesize = filesize($realname); header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header('Content-Transfer-Encoding: binary'); header('Accept-Ranges: bytes'); header('Expires: 0'); header('Cache-Control: must-revalidate, post-check=0, pre-check=0'); header('Pragma: public'); header('Content-Length: ' . $filesize); header('Content-Disposition: attachment; filename=' . $filename); // 打开文件
            $fp = fopen($realname, 'rb'); ob_clean(); ob_end_flush(); while (!feof($fp)) { echo fread($fp, $filesize); ob_flush(); // 刷新PHP缓冲区到Web服务器
                flush(); // 刷新Web服务器缓冲区到浏览器
 } fclose($fp); exit;

完美解决!