无法获取远程文件名到file_get_contents()然后存储文件

$url = 'http://example.com/remote-file.txt';
$file = 'local-file.txt';

$ch = curl_init($url);
$fp = fopen($file, 'wb');

curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_HEADER, 0);

curl_exec($ch);
curl_close($ch);
fclose($fp);

$url = 'http://example.com/remote-file.txt';
$file = 'local-file.txt';

$remoteFile = fopen($url, 'r');
$localFile = fopen($file, 'w');

if ($remoteFile && $localFile) {
    while (!feof($remoteFile)) {
        fwrite($localFile, fread($remoteFile, 8192));
    }
}

fclose($remoteFile);
fclose($localFile);

$url = 'http://example.com/remote-file.txt';
$file = 'local-file.txt';

$context = stream_context_create(array('http' => array('header' => 'User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3')));

$remoteContent = file_get_contents($url, false, $context);

if ($remoteContent !== false) {
    file_put_contents($file, $remoteContent);
}