curl_request_async.inc.php

<?php
/**
 * @author Jay Taylor [@jtaylor]
 *
 * @date 2012-02-23
 *
 * @description Originally found on SO:
 * http://stackoverflow.com/questions/962915/how-do-i-make-an-asynchronous-get-request-in-php
 */

/**
 * @param $requestMethod must equal 'GET' or 'POST'
 * @param $timeout Timeout alue (in seconds)
 */
function curl_request_async($url, $paramsOrBody=NULL, $requestMethod='POST', $timeout=30) {
    $paramsType = gettype($paramsOrBody);

    if ('array' == $paramsType || 'object' == $paramsType) {
        foreach ((array)$paramsOrBody as $key => $val) {
            // Cast to array if needed.
            if (is_object($val)) {
                $val = (array)$val;
            }   
            if (is_array($val)) {
                $val = count($val) == 0 ? '' : implode(',', $val);
            }   
            $preppedParams[] = $key . '=' . urlencode($val);
        }   
        $encodedParams = implode('&', $preppedParams);
    } elseif (NULL != $paramsOrBody && 0 != strlen($paramsOrBody)) {
        // Assume "$paramsOrBody" should be sent as the BODY (as an encoded string.)
        $encodedParams = urlencode($paramsOrBody);
        //error_log("-------->".$encodedParams.'<--------');
    }   

    $hasParams = isset($encodedParams) && strlen($encodedParams) != 0;

    $parts = parse_url($url);

    error_log(var_export($parts, true));
    $fp = fsockopen(
        $parts['host'],
        array_key_exists('port', $parts) ? $parts['port'] : 80, 
        $errno,
        $errstr,
        $timeout
    );  

    // Data goes in the path for a GET request.
    if ($hasParams && 'GET' == $requestMethod) {
        $parts['path'] .= '?' . $encodedParams;
    }   

    $out = strtoupper($requestMethod) . ' ' . $parts['path'] . ' HTTP/1.1' . "\r\n" .
        'Host: ' . $parts['host'] . "\r\n" .
        'Content-Type: application/x-www-form-urlencoded' . "\r\n" .
        'Content-Length: ' . strlen($encodedParams) . "\r\n" .
        'Connection: Close' . "\r\n\r\n";

    // Data goes in the request body for a POST request.
    if ($hasParams && 'POST' == $requestMethod) {
        //error_log("POST PARAMS: $encodedParams");
        $out .= $encodedParams;
    }   

    fwrite($fp, $out);
    fclose($fp);
}