PHP code to control file download speed

This article mainly introduces the method of controlling file download speed in PHP. It analyzes the skills of PHP file operation with examples. It has certain reference value. Friends in need can refer to it.

The examples in this article describe PHP control. File download speed method. The specific implementation method is as follows:

<?php
 /*
 * set here a limit of downloading rate (e.g. 10.20 Kb/s)
 */
 $download_rate = 10.20;
 $download_file = &#39;download-file.zip&#39;; 
 $target_file = &#39;target-file.zip&#39;;
 if(file_exists($download_file)){
  /* headers */
  header(&#39;Last-Modified:&#39;.gmdate(&#39;D, d M Y H:i:s&#39;).&#39;GMT&#39;);
  header(&#39;Cache-control: private&#39;);
  header(&#39;Content-Type: application/octet-stream&#39;);
  header(&#39;Content-Length: &#39;.filesize($download_file));
  header(&#39;Content-Disposition: filename=&#39;.$target_file);
  /* flush content */
  flush();
  /* open file */
  $fh = @fopen($download_file, &#39;r&#39;);
  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(&#39;Fatal error: the &#39;.$download_file.&#39; file does not exist!&#39;);
 }
?>

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