PHP Code implementation control file download speed

This article mainly introduces the PHP control file download Speed method, the example analysis of PHP operation file skills, with a certain reference value, the need for friends can refer to the next

This article explains how PHP controls how fast files are downloaded. The 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 = ' 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 '   of the file to browser *   /print fread ($fh, round ($download _rate * 1 024));   /* 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! ');}? >

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