php curl下载文件并获取标题

Question

i want to download file via curl in php also get headers of that.

// handler
$h = fopen($filePath , 'w');

// curl
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_TIMEOUT, 5);
curl_setopt($ch, CURLOPT_FILE, $h);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_HEADERFUNCTION, array($this, 'getAllHeaders'));
$a = curl_exec($ch); // return false;
curl_close($ch);
fclose($h);

public function getAllHeaders($ch, $header)
{
    // check for 200 ok
    if (preg_match('/HTTP[\/\.0-9\s\t]+200[\s\t]+OK/i', $header)) {

        // header 200 found
        $this->header200 = true;
    }

    // grab all headers keys and values
    preg_match('/^(?P<key>[a-z0-9\-]+)\:(?P<value>.*)$/i', $header, $matches);

    // cycle
    foreach ($matches as $key => $value) {
        if (!is_numeric($key)) {
            $this->headers[strtolower(trim($key))] = trim($value);
        }
    }

    // headers
    return $this->headers;
}

but i cant get headers and file not be downloaded. how can i solve that.

Answer 1

The following constraints apply to getAllHeaders() which you do not satisfy:

The header data must be written when using this callback function. Return the number of bytes written.

Source: php.net

How about:

public function getAllHeaders($ch, $header)
{
    // store header here (how about storing in a field that is an array of headers?)

    return strlen($header);
}