Friday, May 6, 2011

Hiding responses using PHP and Curl

I am reusing a curl function from a long time ago that is now acting differently than I remember. In this particular case, I'm authenticating a user's Twitter credentials. Here's the code as it stands now:

$cred = $_POST['twitter_username'].':'.$_POST['twitter_password'];
$url = "http://twitter.com/account/verify_credentials.json";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_GET, 0);
curl_setopt($ch, CURLOPT_USERPWD, $cred);
$result = curl_exec ($ch);
curl_close ($ch);

This is working fine for the authentication, but is outputting the whole JSON response to the browser, which I don't want to do.

I'm not very familiar with curl. I tried setting CURLOPT_VERBOSE to 0 and false, but neither worked. I'm sure this is a pretty simple change somewhere, but I'm lose on what it is.

Thanks

From stackoverflow
  • You need this option:

    curl_setopt(CURLOPT_RETURNTRANSFER, true);
    

    From the curl docs:

    CURLOPT_RETURNTRANSFER: TRUE to return the transfer as a string of the return value of curl_exec() instead of outputting it out directly.

    Evan : Awesome, thanks a ton!
    Randy : You can also always use ob_start() and ob_end_clean() or ob_get_clean() to temporarily trap all output from PHP, though Roborg's answer is the right way to go in this case.
  • i wrote this function to help simplify my CURL requests

    function curl_http_request ($url, $options)
    {
        $handle = curl_init($url);
        curl_setopt_array($handle, $options);
        ob_start();
        $buffer = curl_exec($handle);
        ob_end_clean();
        curl_close($handle);
        return $buffer;
    }
    

    example of use

    $options = array(
        CURLOPT_RETURNTRANSFER => TRUE,
        CURLOPT_USERPWD => $cred
    );
    
    curl_http_request($url, $options);
    

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