Zebra_cURL::_queue_requests PHP Method

    private function _queue_requests()
    {
        // get the number of remaining urls
        $requests_count = count($this->_requests);
        // iterate through the items in the queue
        for ($i = 0; $i < ($requests_count < $this->threads ? $requests_count : $this->threads); $i++) {
            // remove the first request from the queue
            $request = array_shift($this->_requests);
            // initialize individual cURL handle with the URL
            $handle = curl_init($request['url']);
            // get the handle's ID
            $resource_number = preg_replace('/Resource id #/', '', $handle);
            // if we're downloading something
            if (isset($request['options'][CURLOPT_BINARYTRANSFER]) && $request['options'][CURLOPT_BINARYTRANSFER]) {
                // use parse_url to analyze the string
                // we use this so we won't have hashtags and/or query string in the file's name later on
                $parsed = parse_url($request['url']);
                // open a file and save the file pointer
                $request['file_handler'] = fopen($request['path'] . basename($parsed['path']), 'w+');
                // tell libcurl to use the file for streaming the download
                $this->option(CURLOPT_FILE, $request['file_handler']);
            }
            // set request's options
            foreach ($request['options'] as $key => $value) {
                $this->option($key, $value);
            }
            // in some cases, CURLOPT_HTTPAUTH and CURLOPT_USERPWD need to be set as last options in order to work
            $options_to_be_set_last = array(10005, 107);
            // iterate through all the options
            foreach ($this->options as $key => $value) {
                // if this option is one of those to be set at the end
                if (in_array($key, $options_to_be_set_last)) {
                    // remove the option from where it is
                    unset($this->options[$key]);
                    // add option at the end
                    $this->options[$key] = $value;
                }
            }
            // set options for the handle
            curl_setopt_array($handle, $this->options);
            // add the normal handle to the multi handle
            curl_multi_add_handle($this->_multi_handle, $handle);
            // add request to the list of running requests
            $this->_running['fh' . $resource_number] = $request;
        }
    }