php - RESUME Download? Direct Link? -

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i wrote code uploading files host.for example upload file server server b , after want download pc, when want download it, example via idm, not support resume download.

attention : upload code server b !

<?php  require('config.php');  function is_valid_url($link) {         $link = @parse_url($link);          if ( ! $link) {             return false;         }          $link = array_map('trim', $link);         $link['port'] = (!isset($link['port'])) ? 80 : (int)$link['port'];         $path = (isset($link['path'])) ? $link['path'] : '';          if ($path == '')         {             $path = '/';         }          $path .= ( isset ( $link['query'] ) ) ? "?$link[query]" : '';          if ( isset ( $link['host'] ) , $link['host'] != gethostbyname ( $link['host'] ) )         {             if ( php_version >= 5 )             {                 $headers = get_headers("$link[scheme]://$link[host]:$link[port]$path");             }             else             {                 $fp = fsockopen($link['host'], $link['port'], $errno, $errstr, 30);                  if ( ! $fp )                 {                     return false;                 }                 fputs($fp, "head $path http/1.1\r\nhost: $link[host]\r\n\r\n");                 $headers = fread ( $fp, 128 );                 fclose ( $fp );             }             $headers = ( is_array ( $headers ) ) ? implode ( "\n", $headers ) : $headers;             return ( bool ) preg_match ( '#^http/.*\s+[(200|301|302)]+\s#i', $headers );         }         return false; }      if (isset($_post['pass']) && isset($_post['user'])){           if ($_post['pass'] == $pass && $_post['user'] == $user){        if (!$pass | !$user | !$save | !$link){    include('./error.php');      }elseif(is_valid_url($link) && copy($link, $upload_folder.'/'.$save)){     include('./index.2.php');        }else{    include('./error.php'); }        }else{    include('./error.php');     } } ?>

thanks ...

i can't make heads or tails out of code. want download file server script runs on? if what's head request? or want run script on server , download server b? confusing. if want deal http_range header, parsing http_range header in php


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