使用 curl 下載大文件

Question

我需要使用 curl 下載遠程文件。

這是我擁有的示例代碼：

$ch = curl_init();
curl_setopt($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);

但它不能處理大文件，因為它首先讀取到內存。

是否可以將文件直接流式傳輸到磁盤？

Answer 1

<?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);
?>

Answer 2

我使用這個方便的功能：

通過以 4094 字節的步長下載它，它不會填滿您的內存

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，您可以檢查是否一切正常：

     if (!$result)
         throw new Exception('Download error...');

Answer 3

如果要下載指定 URL 的內容也想將其保存到文件，請查找以下代碼。

<?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);
?>

如果你想從 FTP 服務器下載文件，你可以使用 php FTP 擴展。 請找到以下代碼：

<?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);
?>

Answer 4

當curl用於下載大文件CURLOPT_TIMEOUT是您必須設置的主要選項。

CURLOPT_RETURNTRANSFER必須為真，以防您獲得 pdf/csv/image 等文件。

您可以在此處找到更多詳細信息（正確的網址） Curl Doc

從該頁面：

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

Answer 5

您可以使用此函數，它會在文件系統中創建一個臨時文件，並在一切正常時返回下載文件的路徑：

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;
}