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如下代码实现php限制下载速度:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | <?php /* Source: http://www.apphp.com/index.php?snippet=php-download-file-with-speed-limit */ /* 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!' ); } ?> |