[英]Downloading a large file using curl
我需要使用 curl 下载远程文件。
这是我拥有的示例代码:
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$st = curl_exec($ch);
$fd = fopen($tmp_name, 'w');
fwrite($fd, $st);
fclose($fd);
curl_close($ch);
但它不能处理大文件,因为它首先读取到内存。
是否可以将文件直接流式传输到磁盘?
<?php
set_time_limit(0);
//This is the file where we save the information
$fp = fopen (dirname(__FILE__) . '/localfile.tmp', 'w+');
//Here is the file we are downloading, replace spaces with %20
$ch = curl_init(str_replace(" ","%20",$url));
curl_setopt($ch, CURLOPT_TIMEOUT, 50);
// write curl response to file
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
// get curl response
curl_exec($ch);
curl_close($ch);
fclose($fp);
?>
我使用这个方便的功能:
通过以 4094 字节的步长下载它,它不会填满您的内存
function download($file_source, $file_target) {
$rh = fopen($file_source, 'rb');
$wh = fopen($file_target, 'w+b');
if (!$rh || !$wh) {
return false;
}
while (!feof($rh)) {
if (fwrite($wh, fread($rh, 4096)) === FALSE) {
return false;
}
echo ' ';
flush();
}
fclose($rh);
fclose($wh);
return true;
}
用法:
$result = download('http://url','path/local/file');
然后,您可以检查是否一切正常:
if (!$result)
throw new Exception('Download error...');
如果要下载指定 URL 的内容也想将其保存到文件,请查找以下代码。
<?php
$ch = curl_init();
/**
* Set the URL of the page or file to download.
*/
curl_setopt($ch, CURLOPT_URL,'http://news.google.com/news?hl=en&topic=t&output=rss');
$fp = fopen('rss.xml', 'w+');
/**
* Ask cURL to write the contents to a file
*/
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_exec ($ch);
curl_close ($ch);
fclose($fp);
?>
如果你想从 FTP 服务器下载文件,你可以使用 php FTP 扩展。 请找到以下代码:
<?php
$SERVER_ADDRESS="";
$SERVER_USERNAME="";
$SERVER_PASSWORD="";
$conn_id = ftp_connect($SERVER_ADDRESS);
// login with username and password
$login_result = ftp_login($conn_id, $SERVER_USERNAME, $SERVER_PASSWORD);
$server_file="test.pdf" //FTP server file path
$local_file = "new.pdf"; //Local server file path
##----- DOWNLOAD $SERVER_FILE AND SAVE TO $LOCAL_FILE--------##
if (ftp_get($conn_id, $local_file, $server_file, FTP_BINARY)) {
echo "Successfully written to $local_file\n";
} else {
echo "There was a problem\n";
}
ftp_close($conn_id);
?>
当curl
用于下载大文件CURLOPT_TIMEOUT
是您必须设置的主要选项。
CURLOPT_RETURNTRANSFER
必须为真,以防您获得 pdf/csv/image 等文件。
您可以在此处找到更多详细信息(正确的网址) Curl Doc
从该页面:
curl_setopt($request, CURLOPT_TIMEOUT, 300); //set timeout to 5 mins
curl_setopt($request, CURLOPT_RETURNTRANSFER, true); // true to get the output as string otherwise false
您可以使用此函数,它会在文件系统中创建一个临时文件,并在一切正常时返回下载文件的路径:
function getFileContents($url)
{
// Workaround: Save temp file
$img = tempnam(sys_get_temp_dir(), 'pdf-');
$img .= '.' . pathinfo($url, PATHINFO_EXTENSION);
$fp = fopen($img, 'w+');
$ch = curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
$result = curl_exec($ch);
curl_close($ch);
fclose($fp);
return $result ? $img : false;
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.