[英]curl get remote file and force download at same time
我正在尝试获取远程文件并同时强制将其下载给用户。 贴不上代码,代码太长了。 但是 curl 函数可以工作,但问题是它不会输出任何东西,直到它首先获取远程文件然后强制将其下载给用户。
我用它来告诉 curl 返回一个回调
curl_setopt($ch, CURLOPT_READFUNCTION, 'readCallback');
现在在我的 readCallback 函数中我这样做:
function readCallback($curl, $stream, $maxRead){
$read = fgets($stream, $maxRead);
echo $read;
return $read;
}
但它不会返回任何东西,它只是等待获取远程文件完成。
试试这个,它会使用 curl 来获取文件的总大小,然后下载文件的部分块,将它代理给用户,因为没有等待curl 首先下载它,我用 avi、mp4、mp3 测试了这个和一个exe,希望它有帮助:
<?php
$file = 'http://example.com/somefile.mp3';
download($file,2000);
/*
Set Headers
Get total size of file
Then loop through the total size incrementing a chunck size
*/
function download($file,$chunks){
set_time_limit(0);
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-disposition: attachment; filename='.basename($file));
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Expires: 0');
header('Pragma: public');
$size = get_size($file);
header('Content-Length: '.$size);
$i = 0;
while($i<=$size){
//Output the chunk
get_chunk($file,(($i==0)?$i:$i+1),((($i+$chunks)>$size)?$size:$i+$chunks));
$i = ($i+$chunks);
}
}
//Callback function for CURLOPT_WRITEFUNCTION, This is what prints the chunk
function chunk($ch, $str) {
print($str);
return strlen($str);
}
//Function to get a range of bytes from the remote file
function get_chunk($file,$start,$end){
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $file);
curl_setopt($ch, CURLOPT_RANGE, $start.'-'.$end);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
curl_setopt($ch, CURLOPT_WRITEFUNCTION, 'chunk');
$result = curl_exec($ch);
curl_close($ch);
}
//Get total size of file
function get_size($url){
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_exec($ch);
$size = curl_getinfo($ch, CURLINFO_CONTENT_LENGTH_DOWNLOAD);
return intval($size);
}
?>
尝试像这样使用 curl:
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_HTTPGET, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 60);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
$result = curl_exec($ch);
$msg = new HttpMessage($result);
return $msg->getBody();
返回值是所请求文件的内容,然后您可以输出该内容。 所以不需要回调。 HTTPMessage 文档。
如何获取大(8GB)远程文件并同时强制下载,同时不杀死您的服务器:
<?php
$url = 'http://www.example.com/bigfile.mp4';
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="'.basename($url).'"');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
readfile($url);
readfile()函数将分块读取流,并将其打印到输出,因此它不会使用太多内存......
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