php控制文件下载速度的方法

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。