php断点下载

ycycoco

<?php
/**
* PHP-HTTP断点续传实现
* @param string $path: 文件所在路径
* @param string $file: 文件名
* @return void
*/
function download($path, $file) {
$real = $path . '/' . $file;
if (! file_exists ( $real )) {
return false;
}
$size = filesize ( $real );
$size2 = $size - 1;
$range = 0;
if (isset ( $_SERVER ['HTTP_RANGE'] )) {
header ( 'HTTP /1.1 206 Partial Content' );
$range = str_replace ( '=', '-', $_SERVER ['HTTP_RANGE'] );
$range = explode ( '-', $range );
$range = trim ( $range [1] );
header ( 'Content-Length:' . $size );
header ( 'Content-Range: bytes ' . $range . '-' . $size2 . '/' . $size );
} else {
header ( 'Content-Length:' . $size );
header ( 'Content-Range: bytes 0-' . $size2 . '/' . $size );
}
header ( 'Accenpt-Ranges: bytes' );
header ( 'application/octet-stream' );
header ( "Cache-control: public" );
header ( "Pragma: public" );
//解决在IE中下载时中文乱码问题

$ua = $_SERVER ['HTTP_USER_AGENT'];
if (preg_match ( '/MSIE/', $ua )) {
$ie_filename = str_replace ( '+', '%20', urlencode ( $file ) );
header ( 'Content-Dispositon:attachment; filename=' . $ie_filename );
} else {
header ( 'Content-Dispositon:attachment; filename=' . $file );
}
$fp = fopen ( $real, 'rb+' );
fseek ( $fp, $range );
while ( ! feof ( $fp ) ) {
set_time_limit ( 0 );
print (fread ( $fp, 1024 )) ;
flush ();
ob_flush ();
}
fclose ( $fp );
}
/*End of PHP*/
 
            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;