/**
*
* @param string $url 请求的地址
* @param array $post_data post数组
* @param int $timeout 超时设置
* @param sting $headers http头
* @param string $return http响应数据。可以是code， header，body，error
*/
public static function send($post_data = array(), $timeout = 5, $headers = array(), $return = 'body')
{
if (self::$open_debug) {
self::$debug[] = self::$url;
}
$request = self::get_request($post_data);
unset($post_data);
$post_string = '';
if (!empty($request)) {
if (self::$open_debug) {
self::$debug[] = $request;
}
$post_string = http_build_query($request, '', '&');
unset($request);
}
$response = self::curl_send(self::$url, $post_string, empty($timeout) ? self::$timeout : $timeout, empty($headers) ? array() : $headers);
unset($post_string, $timeout, $headers);
if (self::$open_debug) {
self::$debug[] = $response;
}
if (strpos($response['header'], 'session_id=')) {
self::$session_id = substr(strstr($response['header'], 'session_id='), 11, 33);
}
self::reset();
return isset($response[$return]) ? $response[$return] : $response;
}
