好用的php header下載函數

/** * 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 boolean $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, $contentType = '') { if (!is_readable($fileName)) { header("HTTP/1.1 404 Not Found"); return false; } $fileStat = stat($fileName); $lastModified = $fileStat['mtime']; $md5 = md5($fileStat['mtime'] .'='. $fileStat['ino'] .'='. $fileStat['size']); $etag = '"' . $md5 . '-' . crc32($md5) . '"'; header('Last-Modified: ' . 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']) >= $lastModified) { header("HTTP/1.1 304 Not Modified"); return true; } if (isset($_SERVER['HTTP_IF_UNMODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_UNMODIFIED_SINCE']) < $lastModified) { header("HTTP/1.1 304 Not Modified"); return true; } if (isset($_SERVER['HTTP_IF_NONE_MATCH']) && $_SERVER['HTTP_IF_NONE_MATCH'] == $etag) { header("HTTP/1.1 304 Not Modified"); return true; } if ($fancyName == '') { $fancyName = basename($fileName); } 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 < 0 ? 0 : $startPos; $endPos = $endPos > $fileSize - 1 ? $fileSize - 1 : $endPos; $length = $endPos - $startPos + 1; if ($length < 0) { return false; } $contentLength = $length; $isPartial = true; } } // send headers if ($isPartial) { header('HTTP/1.1 206 Partial Content'); header("Content-Range: bytes $startPos-$endPos/$fileSize"); } else { header("HTTP/1.1 200 OK"); $startPos = 0; $endPos = $contentLength - 1; } header('Pragma: cache'); header('Cache-Control: public, must-revalidate, max-age=0'); header('Accept-Ranges: bytes'); header('Content-type: ' . $contentType); header('Content-Length: ' . $contentLength); if ($forceDownload) { header('Content-Disposition: attachment; filename="' . rawurlencode($fancyName). '"');//漢字自動轉為URL編碼 header('Content-Disposition: attachment; filename="' . $fancyName. '"'); } header("Content-Transfer-Encoding: binary"); // header函數實現檔案下載 $bufferSize = 2048; if ($speedLimit != 0) { $packetTime = floor($bufferSize * 1000000 / $speedLimit); } $bytesSent = 0; $fp = fopen($fileName, "rb"); fseek($fp, $startPos); //fpassthru($fp); while ($bytesSent < $contentLength && !feof($fp) && connection_status() == 0 ) { if ($speedLimit != 0) { list($usec, $sec) = explode(" ", microtime()); $outputTimeStart = ((float)$usec + (float)$sec); } // bbs.it-home.org $readBufferSize = $contentLength - $bytesSent < $bufferSize ? $contentLength - $bytesSent : $bufferSize; $buffer = fread($fp, $readBufferSize); echo $buffer; ob_flush(); flush(); $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); } } } return true; } ?> 複製代碼

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