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用php实现文件下载, 同时支持下断点形式

2012-07-20 19:04 736 查看
ob_start();
$size = filesize($file_dir . $file_name);
// 输入文件标签
Header("Content-type: application/octet-stream");
Header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
Header("Content-length: " . $size);

$encoded_filename = urlencode($down_name);
$encoded_filename = str_replace("+", "%20", $encoded_filename);

$ua = $_SERVER["HTTP_USER_AGENT"];
// 处理下载的时候的文件名
if (preg_match("/MSIE/", $ua)) {
header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');
} else if (preg_match("/Firefox/", $ua)) {
header('Content-Disposition: attachment; filename*="utf8\'\'' . $down_name . '"');
} else {
header('Content-Disposition: attachment; filename="' . $down_name . '"');
}
$fp = fopen($file_dir . $file_name, "r"); // 打开文件

if (isset($_SERVER['HTTP_RANGE']) && ($_SERVER['HTTP_RANGE'] != "") && preg_match("/^bytes=([0-9]+)-/i", $_SERVER['HTTP_RANGE'], $match) && ($match[1] < $size)) {
$range = $match[1];
fseek($fp, $range);
header("HTTP/1.1 206 Partial Content");
//header("Date: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s", filemtime($file_dir . $file_name)) . " GMT");
header("Accept-Ranges: bytes");
$rangesize = ($size - $range) > 0 ? ($size - $range) : 0;
header("Content-Length:" . $rangesize);
header("Content-Range: bytes " . $range . '-' . ($size - 1) . "/" . $size);
// header("Connection: close" . "\n\n" );
//header("Connection: close"." ");
} else {
header("Content-Length: " . (string) ($size));
header("Accept-Ranges: bytes");
$range = 0;
header("Content-Range: bytes " . $range . '-' . ($size - 1) . "/" . $size);
}
fpassthru($fp);
ob_end_flush();
fclose($fp);
exit;
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