PHP:如何限制文件下载速度
下载系统呢,很多人都应该接触过,很简单的一个PHP应用嘛。不过呢,谈到PHP限速下载,估计就有些人摸不着头脑了。其实呢,这个也很简单的哦。下面就着一个简单的PHP下载功能结合限制速度给出一段代码。但愿对初学者有些许帮助哦: // 本地文件 $local_file =
下载系统呢,很多人都应该接触过,很简单的一个PHP应用嘛。不过呢,谈到PHP限速下载,估计就有些人摸不着头脑了。其实呢,这个也很简单的哦。下面就着一个简单的PHP下载功能结合限制速度给出一段代码。但愿对初学者有些许帮助哦:
// 本地文件 $local_file = ’test-file.zip’; // 下载是设置的默认名称 $download_file = ’your-download-name.zip’; // 限制下载速度在20.5KB/s $download_rate = 20.5; //检测文件是否存在 并且保证文件有效 if(file_exists($local_file) && is_file($local_file)) { //发送头部标识 header(‘Cache-control: private‘); header(‘Content-Type: application/octet-stream’); header(‘Content-Length: ’.filesize($local_file)); header(‘Content-Disposition: filename=’.$download_file); //刷新输出缓冲 flush(); //打开文件 $file = fopen($local_file, “r”); while (!feof($file)) { // 发送文件喽 print fread($file, round($download_rate * 1024)); // 缓冲到浏览器 flush(); //暂停1秒执行 sleep(1); } //关闭文件流 fclose($file); } else { die(‘错误: 文件——’.$local_file.’ 不存在!’); }
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