php - SimpleXMLElement' is not allowed in session_write_close() -

im not sure do. im trying make session string inside of function , parse session outside of , if makes sense.... im getting error "simplexmlelement' not allowed in session_write_close()" suggestions on can solve it?

function api_info($form, &$form_state){          $server_url = 'website api url'          curl_setopt($ch,    curlopt_url,               $server_url              );         curl_setopt($ch,    curlopt_post,              0                        );         curl_setopt($ch,    curlopt_postfields,                                 );             curl_setopt($ch,    curlopt_httpheader,        array("expect:")         );         curl_setopt($ch,    curlopt_failonerror,       1                        );         curl_setopt($ch,    curlopt_followlocation,                             );         curl_setopt($ch,    curlopt_header,            false                    );         curl_setopt($ch,    curlopt_returntransfer,    1                        );         curl_setopt($ch,    curlopt_ssl_verifypeer,    false                    );         curl_setopt($ch,    curlopt_ssl_verifyhost,    false                    );          curl_setopt($ch,    curlopt_timeout,           120                      );         curl_setopt($ch,    curlinfo_header_out,       true                     );         curl_setopt($ch,    curlopt_http_version,      curl_http_version_1_1    );          $xml_response_lead_point = curl_exec($ch);         $xml_request_lead_point = new simplexmlelement($xml_response_lead_point);           $result = reset($xml_request_lead_point->sm);          $xml_request = $xml_request_lead_point;          $xml_results = array(                 'lead_response' => $result,                 'results'       => $xml_request,         );          //dvm($xml_results['results']);         //dvm($xml_request_lead_point);         //dvm($a);          $_session['lead_results'] = $xml_results['results'];          return $xml_results; }  $lead_results = $_session['lead_results']; var_dump($lead_results); 

you need serialize() simplexmlelement (or object) before stored in session , unserialize() use.

$xml_obj = new simplexmlelement( $xml_string ); $_session['xml_value'] = serialize( $xml_obj ); $xml_obj2 = unserialize( $_session['xml_value'] );  

alternatively save xml string used create object.