PHP Curl和setcookie问题

$field_array= array(
      \'Accept\' => \'HTTP_ACCEPT\',
      \'Accept-Charset\' => \'HTTP_ACCEPT_CHARSET\',
      \'Accept-Encoding\' => \'HTTP_ACCEPT_ENCODING\',
      \'Accept-Language\' => \'HTTP_ACCEPT_LANGUAGE\',
      \'Connection\' => \'HTTP_CONNECTION\',
      \'Host\' => \'HTTP_HOST\',
      \'Referer\' => \'HTTP_REFERER\',
      \'User-Agent\' => \'HTTP_USER_AGENT\'
      );

$curl_request_headers=array();

foreach ($field_array as $key => $value) {
   if(isset($_SERVER[\"$value\"])) {
      $server_value=$_SERVER[\"$value\"];
      $curl_request_headers[]=\"$key: $server_value\";
   }
};
$curl_request_headers[]=\"Expect: \";

session_write_close();


//Open connection
$curl_handle = curl_init();
curl_setopt($curl_handle,CURLOPT_COOKIE,session_name().\"=\".session_id().\";\");
//Set the url, POST data
curl_setopt($curl_handle, CURLOPT_URL, $curl_url);
curl_setopt($curl_handle, CURLOPT_POST, !empty($user_post_data));
curl_setopt($curl_handle, CURLOPT_POSTFIELDS, $user_post_data);
curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl_handle, CURLOPT_AUTOREFERER, TRUE);
curl_setopt($curl_handle, CURLOPT_HEADER, 1);
curl_setopt($curl_handle, CURLOPT_FOLLOWLOCATION, false);
curl_setopt($curl_handle, CURLOPT_HTTPHEADER, $curl_request_headers);
curl_setopt($curl_handle, CURLOPT_SSL_VERIFYPEER, false);

$result = curl_exec($curl_handle);
//Close connection
curl_close($curl_handle);
list($headers,$content)=explode(\"\\r\\n\\r\\n\",$result,2);
foreach (explode(\"\\r\\n\",$headers) as $hdr) {
   if(preg_match(\"/Transfer-Encoding:.*chunked/i\", $hdr)) {
      // Remove chunked headers. Not properly handled by browsers
   } else {
      header($hdr);
   };
}
echo $content;

......
$_COOKIE[session_name()]=session_id();

$cookie_string=\"\";
foreach( $_COOKIE as $key => $value ) {
  $cookie_string .= \"$key=$value;\";
};

//Open connection
$curl_handle = curl_init();
curl_setopt($curl_handle,CURLOPT_COOKIE, $cookie_string);
......