Are there potential pitfalls in using CURLOPT_BUFFERSIZE to limit the size of downloaded files with CURL in PHP?

Using CURLOPT_BUFFERSIZE to limit the size of downloaded files with CURL in PHP can potentially lead to incomplete downloads if the buffer size is smaller than the file being downloaded. It is recommended to use CURLOPT_FILE to save the downloaded file directly to disk and then check the file size to ensure it does not exceed the desired limit. 

$ch = curl_init();
$file = fopen('downloaded_file.txt', 'w');

curl_setopt($ch, CURLOPT_URL, 'http://example.com/large_file.zip');
curl_setopt($ch, CURLOPT_FILE, $file);

curl_exec($ch);

$fileSize = filesize('downloaded_file.txt');
$limit = 10 * 1024 * 1024; // 10 MB limit

if ($fileSize > $limit) {
    unlink('downloaded_file.txt');
    echo 'File size exceeds limit.';
}

fclose($file);
curl_close($ch);

Keywords

CURLOPT_BUFFERSIZE downloaded files CURL PHP limitations

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