curl - PHP CURLOPT_WRITEFUNCTION doesn't appear to be called

Solution:

Lets look at option description from this manual http://www.php.net/manual/en/function.curl-setopt.php:

CURLOPT_WRITEFUNCTION The name of a callback function where the callback function takes two parameters. The first is the cURL resource, and the second is a string with the data to be written. The data must be saved by using this callback function. It must return the exact number of bytes written or the transfer will be aborted with an error.

So, it means what a response can be split into several pieces of data. For appropriate receiving of first 20000 bytes you must add $full_length counter:

$full_length = 0;
function receiveResponse($ch,$string) use (&$full_length) {
    $length = strlen($string);
    $full_length += $length;
    if($full_length >= 20000) { return -1; }
    return $length;
}
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