php安全下載（cpu使用）

Question

我說不出英語 不好意思！ 我需要一個PHP安全下載 當我下載一個大文件 CPU使用率過高 什麼解決的辦法，我用這個代碼 但 ？

我的CPU使用率

http://s2.picofile.com/file/7726178274/Untitled_1.jpg

<?php 
@ini_set('error_reporting', E_ALL & ~ E_NOTICE); 
//- turn off compression on the server 
if(function_exists("apache_setenv")) 
    @apache_setenv('no-gzip', 1); 
@ini_set('zlib.output_compression', 'Off'); 
if(!isset($_REQUEST['file']) || empty($_REQUEST['file'])) 
{ 
    header("HTTP/1.0 400 Bad Request"); 
    exit; 
} 
// sanitize the file request, keep just the name and extension 
// also, replaces the file location with a preset one ('./myfiles/' in this example) 
$file_path = $_REQUEST['file']; 
$path_parts = pathinfo($file_path); 
$file_name = $path_parts['basename']; 
$file_ext = $path_parts['extension']; 
//$file_path = './myfiles/' . $file_name; 
// allow a file to be streamed instead of sent as an attachment 
$is_attachment = isset($_REQUEST['stream']) ? false : true; 
// make sure the file exists 
if (is_file($file_path)) 
{ 
    $file_size = filesize($file_path); 
    $file = @fopen($file_path,"rb"); 
    if ($file) 
    { 
     // set the headers, prevent caching 
     header("Pragma: public"); 
     header("Expires: -1"); 
     header("Cache-Control: public, must-revalidate, post-check=0, pre-check=0"); 
     header("Content-Disposition: attachment; filename=\"$file_name\""); 

     // set appropriate headers for attachment or streamed file 
     if ($is_attachment) { 
       header("Content-Disposition: attachment; filename=\"$file_name\""); 
     } 
     else { 
       header('Content-Disposition: inline;'); 
       header('Content-Transfer-Encoding: binary'); 
     } 

     // set the mime type based on extension, add yours if needed. 
     $ctype_default = "application/octet-stream"; 
     $content_types = array(
       "exe" => "application/octet-stream", 
       "zip" => "application/zip", 
       "mp3" => "audio/mpeg", 
       "mpg" => "video/mpeg", 
       "avi" => "video/x-msvideo", 
     ); 
     $ctype = isset($content_types[$file_ext]) ? $content_types[$file_ext] : $ctype_default; 
     header("Content-Type: " . $ctype); 

     //check if http_range is sent by browser (or download manager) 
     if(isset($_SERVER['HTTP_RANGE'])) 
     { 
      list($size_unit, $range_orig) = explode('=', $_SERVER['HTTP_RANGE'], 2); 
      if ($size_unit == 'bytes') 
      { 
       //multiple ranges could be specified at the same time, but for simplicity only serve the first range 
       //http://tools.ietf.org/id/draft-ietf-http-range-retrieval-00.txt 
       list($range, $extra_ranges) = explode(',', $range_orig, 2); 
      } 
      else 
      { 
       $range = ''; 
       header('HTTP/1.1 416 Requested Range Not Satisfiable'); 
       exit; 
      } 
     } 
     else 
     { 
      $range = ''; 
     } 

     //figure out download piece from range (if set) 
     list($seek_start, $seek_end) = explode('-', $range, 2); 

     //set start and end based on range (if set), else set defaults 
     //also check for invalid ranges. 
     $seek_end = (empty($seek_end)) ? ($file_size - 1) : min(abs(intval($seek_end)),($file_size - 1)); 
     $seek_start = (empty($seek_start) || $seek_end < abs(intval($seek_start))) ? 0 : max(abs(intval($seek_start)),0); 

     //Only send partial content header if downloading a piece of the file (IE workaround) 
     if ($seek_start > 0 || $seek_end < ($file_size - 1)) 
     { 
      header('HTTP/1.1 206 Partial Content'); 
      header('Content-Range: bytes '.$seek_start.'-'.$seek_end.'/'.$file_size); 
      header('Content-Length: '.($seek_end - $seek_start + 1)); 
     } 
     else 
      header("Content-Length: $file_size"); 

     header('Accept-Ranges: bytes'); 

     set_time_limit(0); 
     fseek($file, $seek_start); 

     while(!feof($file)) 
     { 
      print(@fread($file, 1024*8)); 
      ob_flush(); 
      flush(); 
      if (connection_status()!=0) 
      { 
       @fclose($file); 
       exit; 
      }   
     } 

     // file save was a success 
     @fclose($file); 
     exit; 
    } 
    else 
    { 
     // file couldn't be opened 
     header("HTTP/1.0 500 Internal Server Error"); 
     exit; 
    } 
} 
else 
{ 
    // file does not exist 
    header("HTTP/1.0 404 Not Found"); 
    exit; 
} 
?> 

Answer 1

對於大文件，你最好使用XSEND文件，Apache的一個模塊，很容易設置和最重要的是，與大文件完美。 https://tn123.org/mod_xsendfile/

php解決方案意味着您需要在提供下載內容之前閱讀內存中的所有文件，這是一個相當大的問題，如您所見。