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I found a way to maintain session using a curl call.

Below is a function I found on the web.

I modified the function to handle session and basic authentication.

//See Updates and explanation at: https://github.com/tazotodua/useful-php-scripts/
function get_remote_data($url, $post_paramtrs=false)
{
        if (session_status() == PHP_SESSION_NONE) {
                session_start();
        }
        
        $useragent = $_SERVER['HTTP_USER_AGENT'];
        $strCookie = 'PHPSESSID=' . $_COOKIE['PHPSESSID'] . '; path=/';
        
        session_write_close();
        
        $c = curl_init();
        curl_setopt($c, CURLOPT_URL, $url);
        curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
        if($post_paramtrs)
        {
                curl_setopt($c, CURLOPT_POST,TRUE);
                curl_setopt($c, CURLOPT_POSTFIELDS, "var1=bla&".$post_paramtrs );
        }
        curl_setopt($c, CURLOPT_SSL_VERIFYHOST,false);
        curl_setopt($c, CURLOPT_SSL_VERIFYPEER,false);
        curl_setopt($c,CURLOPT_USERAGENT, $useragent);
        curl_setopt( $c, CURLOPT_COOKIE, $strCookie );
        curl_setopt($c, CURLOPT_MAXREDIRS, 10);
        $follow_allowed= ( ini_get('open_basedir') || ini_get('safe_mode')) ? false:true;
        if ($follow_allowed)
        {
                curl_setopt($c, CURLOPT_FOLLOWLOCATION, 1);
        }
        curl_setopt($c, CURLOPT_CONNECTTIMEOUT, 9);
        curl_setopt($c, CURLOPT_REFERER, $url);
        curl_setopt($c, CURLOPT_TIMEOUT, 60);
        curl_setopt($c, CURLOPT_AUTOREFERER, true);
        curl_setopt($c, CURLOPT_ENCODING, 'gzip,deflate');

        //Optional authentication
        $username='test';
        $password='12345';
        curl_setopt($c, CURLOPT_USERPWD, "$username:$password");
        curl_setopt($c, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);


        $data=curl_exec($c);
        $status=curl_getinfo($c);
        curl_close($c);
        preg_match('/(http(|s)):\/\/(.*?)\/(.*\/|)/si',  $status['url'],$link); $data=preg_replace('/(src|href|action)=(\'|\")((?!(http|https|javascript:|\/\/|\/)).*?)(\'|\")/si','$1=$2'.$link[0].'$3$4$5', $data);   $data=preg_replace('/(src|href|action)=(\'|\")((?!(http|https|javascript:|\/\/)).*?)(\'|\")/si','$1=$2'.$link[1].'://'.$link[3].'$3$4$5', $data);
        if($status['http_code']==200)
        {
                return $data;
        }
        elseif($status['http_code']==301 || $status['http_code']==302)
        {
                if (!$follow_allowed)
                {
                        if (!empty($status['redirect_url']))
                        {
                                $redirURL=$status['redirect_url'];
                        }
                        else
                        {
                                preg_match('/href\=\"(.*?)\"/si',$data,$m);
                                if (!empty($m[1]))
                                {
                                        $redirURL=$m[1];
                                }
                        }
                        if(!empty($redirURL))
                        {
                                return  call_user_func( __FUNCTION__, $redirURL, $post_paramtrs);
                        }
                }
        }
        return "ERRORCODE22 with $url!!<br/>Last status codes<b/>:".json_encode($status)."<br/><br/>Last data got<br/>:$data";
}

You get the html content by using one of these calls:

GET request:

$html = get_remote_data('http://example.com?var1=something'); // GET request

POST request:

$html = get_remote_data('http://example.com', "var2=something&var3=blabla" ); // POST request