Problems with CURL using an HTTP Proxy on PHP5

["Francisco M. Marzoa Alonso" <francisco@xxxxxxxxxx>]

Hello,

The following code is failing and I do not find the cause (please, note
that checkurl value and CURLOPT_PROXY are NOT the real values I'm using,
of course):

        $ch = curl_init();
        $checkurl = 'http://mycheckhost.com/';
        curl_setopt ($ch, CURLOPT_TIMEOUT, 6000);
        curl_setopt ($ch, CURLOPT_URL, $checkurl);
        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt ($ch, CURLOPT_HEADER, false);
        curl_setopt ($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
        curl_setopt ($ch, CURLOPT_PROXY, '1.2.3.4:8888' );

        $data = curl_exec($ch);
        $curl_info = curl_getinfo ($ch);

        if ( $data === false ) {
            $rtn = false;
        } else {
            $rtn = true;
        }

        return $rtn;

Every curl_exec returns false, and a var_dump of $curl_info looks as
follows:

array(21) {
  ["url"]=>
  string(25) "http://mycheckhost.com/";
  ["content_type"]=>
  NULL
  ["http_code"]=>
  int(0)
  ["header_size"]=>
  int(0)
  ["request_size"]=>
  int(99)
  ["filetime"]=>
  int(-1)
  ["ssl_verify_result"]=>
  int(0)
  ["redirect_count"]=>
  int(0)
  ["total_time"]=>
  float(1.843925)
  ["namelookup_time"]=>
  float(0.00018)
  ["connect_time"]=>
  float(0.333015)
  ["pretransfer_time"]=>
  float(0)
  ["size_upload"]=>
  float(0)
  ["size_download"]=>
  float(0)
  ["speed_download"]=>
  float(0)
  ["speed_upload"]=>
  float(0)
  ["download_content_length"]=>
  float(-1)
  ["upload_content_length"]=>
  float(-1)
  ["starttransfer_time"]=>
  float(0)
  ["redirect_time"]=>
  float(0)
  ["certinfo"]=>
  array(0) {
  }
}


I know it is NOT a problem with the website, because if I comment out
the line curl_setopt ($ch, CURLOPT_HTTPPROXYTUNNEL, 1) disabling the use
of a proxy, it works fine.

I know the proxy is working fine, because if I use curl from command
line like:

curl -x 1.2.3.4:8888 http://mycheckhost.com/

It also WORKS fine.

So the problem may be or within the PHP5 curl implementation, or in my
own code, but I have not been able to find the problem with my code.

Any hints?

BTW:

$ php --version
PHP 5.3.6-13ubuntu3.3 with Suhosin-Patch (cli) (built: Dec 13 2011
18:37:10)
Copyright (c) 1997-2011 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies



Thanks a lot in advance,

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