Unable to exchange Session Data in CURL - php

Question

I call invoke.php using CURL from curl.php from my localhost. In invoke.php i store some data in session. But when i try to access those session data from curl.php, don't get those session data. How i get those values?
Content of curl.php
`include_once ('session.php');
$handles = array();
$urlArray = array('http://localhost/invoke.php' );
foreach($urlArray as $url){
// create a new single curl handle
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
// add this handle to the multi handle
curl_multi_add_handle($mh,$ch);
// put the handles in an array to loop this later on
$handles[] = $ch;
}
// execute the multi handle
$running=null;
do {
curl_multi_exec($mh,$running);
// added a usleep for 0.25 seconds to reduce load
usleep (250000);
} while ($running > 0);
// get the content of the urls (if there is any)
for($i=0;$i
{
// get the content of the handle
// $output.= curl_multi_getcontent($handles[$i]);
// remove the handle from the multi handle
curl_multi_remove_handle($mh,$handles[$i]);
}
echo SessionHandler :: getData('DATA');
`
Content of invoke.php
include_once ('session.php');
echo SessionHandler :: setData('DATA', 'HELLO WORLD');

Answer 1

There are two possible issues:
You can't be sure that both scripts will access same session (have same session id), actually I can bet they have separate sessions. Of course, you could enforce that by sending the session id from invoke.php to curl.php by adding an extra parameter tot the URL and then use that parameter to force the session id in curl.php
Second possible issue is that the session variables are read on session_start (that's when the $_SESSION is populated), but you modify the session content after you start the session (in session.php, I assume), that's why any changes (even if the conditions on 1. will be met), will not reflect into already opened session in invoke.php. I think you should force session to close and restart it.

Answer 2

I had the same issue. This is how I resolved it:
function getContent($url){
$cookiesStr = '';
foreach($_COOKIE as $k => $v){
$cookiesStr.= $k . '=' . $v . '; ';
}#end COOKIE
$cookiesStr = rtrim($cookiesStr, ' ');
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_COOKIEFILE, '/tmp/cookies.txt');
curl_setopt($ch, CURLOPT_COOKIEJAR, '/tmp/cookies.txt');
curl_setopt ($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_COOKIE, $cookiesStr);
ob_start();
curl_exec ($ch);
curl_close ($ch);
$string = ob_get_contents();
ob_end_clean();
return $string;
}#end getContent
You have to have a tmp cookie jar or it will produce an infinite loop. You have to send cookies or you will not get a result.

Answer 3

I able to solve this problem. I set curl_
setopt($ch, CURLOPT_COOKIE,session_name().'='.session_id());
to use same session id and use php's session_write_close() function to write session data.