这篇文章主要介绍了php控制文件下载速度的方法,实例分析了php操作文件的技巧,具有一定参考借鉴价值,需要的朋友可以参考下
本文实例讲述了php控制文件下载速度的方法。分享给大家供大家参考。具体实现方法如下:
- <?php
- /*
- * set here a limit of downloading rate (e.g. 10.20 Kb/s)
- */
- $download_rate = 10.20;
- $download_file = 'download-file.zip';
- $target_file = 'target-file.zip';
- if(file_exists($download_file)){
- /* headers */
- header('Last-Modified:'.gmdate('D, d M Y H:i:s').'GMT');
- header('Cache-control: private');
- header('Content-Type: application/octet-stream');
- header('Content-Length: '.filesize($download_file));
- header('Content-Disposition: filename='.$target_file);
- /* flush content */
- flush();
- /* open file */
- $fh = @fopen($download_file, 'r');
- while(!feof($fh)){
- /* send only current part of the file to browser */
- print fread($fh, round($download_rate * 1024));
- /* flush the content to the browser */
- flush();
- /* sleep for 1 sec */
- sleep(1);
- }
- /* close file */
- @fclose($fh);
- }else{
- die('Fatal error: the '.$download_file.' file does not exist!');
- }
- ?>
希望本文所述对大家的php程序设计有所帮助。
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