php下载远程大文件的实例

// 暂不支持断点续传

// $url = 'http://www.my*t*e*st.com/debian.iso' 不知道为何获取本地文件大小为0

$url='http://192.1**68.*8.93/download/vm-672/18/0.vmdk'

$file=basename($url);

$header= get_headers($url, 1);

$size=$header['Content-Length'];

$fp=fopen($url,'rb');

if($fp=== false)exit('文件不存在或打开失败');

header('Content-Description: File Transfer');

header('Content-Type: application/octet-stream');

header('Content-Disposition: attachment; filename="'.$file.'"');

header('Content-Transfer-Encoding: binary');

header('Expires: 0');

header('Cache-Control: must-revalidate, post-check=0, pre-check=0');

header('Pragma: public');

header('Content-Length: '.$size);

ob_clean();

ob_end_flush();

set_time_limit(0);

$chunkSize= 1024 * 1024;

while(!feof($fp)) {

$buffer=fread($fp,$chunkSize);

echo$buffer;

ob_flush();

flush();

}

fclose($fp);

exit;