好用的php header下載函數

複製程式碼

/**
 * 傳送檔案
 *
 * @param string $fileName 檔案名稱或路徑
 * @param string $fancyName 自訂的檔案名稱,為空白則使用filename
 * @param booleanName 自訂的檔案名稱,為空則使用filename
 * @param booleanName 自訂的檔案名稱,為空則使用filename
 * @param booleanName $forceDownload 是否強制下載
 * @param integer $speedLimit 速度限制,單位為位元組,0為不限制,不支援windows伺服器
 * @param string $$contentType 檔案類型,預設為application/octet- stream
 *
 * @return boolean
*/
function sendFile($fileName, $fancyName = ' ', $forceDownload = true, $speedLimit = 0, $contentType = '')
{
 if (!is_read($fileName))
 {
 header("HTTP/1.1 404 找不到") ;
 return false;
 }
 $fileStat = stat($fileName);
 $lastModified = $fileStat['mtime'];
 ;    $md5 = md5($fileStat['mtime'] .'='.$fileStat['ino'] .'='.$fileStat['size']);
 $etag = '"' . $md5 '-' .crc32($md5) '"';
 header('最後修改時間: ' .gmdate("D, d M Y H:i:s", $lastModified) . ' GMT');
 header("ETag: $etag");
 if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $ > {
 header("HTTP/1.1 304 未修改");
 return true;
 }
 if (isset($_SERVER['HTTP_IF_UNMODIFIED_SINCE']) & strtotime(P.D. ) '])  {
 header("HTTP /1.1 304 未");
 return true;
 }
 if (isset($_SERVER['HTTP_IF_NONE_MATMATCH'] ) && $_SERVER['HTTP_IF_NONE_MATCH'] == $etag)
 {
 header("HTTP/1.1 304 未修改");
 return true;
 }
 }
 if ($ffancyName == '')
 {
 $fancyName = 基本名稱($檔名);
 }
 if ($contentType == '')
 {
 $contentType = 'application/octet-stream';
 }
 $fileSize = $fileStat['size'];
 $contentLength = $fileSize;
 $isPartial = false;
 if (isset($_SERVER['HTTP_RANGE']))
 {
 if (preg_match ('/^bytes=(d*)) -(d*)$/', $_SERVER['HTTP_RANGE'], $matches))
 {
 $startPos = $matches[1];
 $endPos = $matches[2];
 if ($startPos == '' && $endPos == '')
 {
 return false;
 }
  if ($startPos == '')
 {
 $startPos = $fileSize - $endPos;
 $endPos = $fileSize - 1;
 }
 else if ($ endPos == '')
 {
 $endPos = $fileSize - 1;
 }
 $startPos = $startPos  $endPos = $endPos > $檔案大小 - 1 ? $fileSize - 1 : $endPos;
 $length = $endPos - $startPos 1;
 if ($length  {
 return false;
 }
 {
 return false;
 }
 $ contentLength = $length;
 $isPartial = true;
 }
 }
 // 傳送headers
 if ($isPartial)
 {
 header ('HTTP/1.1 206 部分內容');
 header("Content-Range: bytes $startPos-$endPos/$fileSize ");
 }
 else
 {
 header("HTTP/1.1 200 OK");
 $startPos = 0;
 $endPos = $contentLength - 1;
 }
 header ('Pragma: 儲存') ;
 header('Cache-Control: public, Must-revalidate, max-age=0');
 header('Accept-Ranges: bytes');
 header ('內容類型：' . $contentType);
 header('內容長度：' . $contentLength);
 if ($forceDownload)
 {
 header('Content-Disposition:attachment; filename="' .rawurlencode($fancyName). '"');//漢字自動轉為編碼URL
 header( 'Content-Disposition:attachment; filename="' . $fancyName.'"');
 }
 header("Content-Transfer-Encoding：binary");
 // header 函數實作檔案下載 $bufferSize = 2048; if ($ speedLimit != 0) { $packetTime = Floor($bufferSize * 1000000 / $speedLimit); }
 $bytesSent = 0;
 $fp = fopen($fileName, "rb");
 fseek($fp, $startPos);
 //fpassthru($fp); p >
 while ($bytesSent  {
 if ($speedLimit != 0)
 {
 if ($speedLimit != 0)
 {
 { list($usec, $sec) = 爆炸(" ", microtime());
 $outputTimeStart = ((float)$usec (float)$sec);
 } // bbs.it-home.org
 $readBufferSize = $contentLength - $bytesSent
 $ 寬度尺寸$ contentLength - $bytesSent : $bufferSize;
 $buffer = fread($fp, $readBufferSize);
 echo $buffer;
 ob_flush();
lush();
 $bytesSent = $readBufferSize;
 if ($speedLimit != 0)
 {
 list($usec, $sec) = Explode(" ", microtime());
 $outputTimeEnd = ((float)$usec (float)$sec);
 $useTime = ((float) $outputTimeEnd - (float) $outputTimeStart) * 1000000;
 $sleepTime = round($packetTime - $useTime);
 if ($sleepTime > 0)
 {
 usleep($sleepTime);
 }
 }
 }
 }