PHP Session Lost -

i know there lot of questions out there dont give info or use other methods authenticate. lets begin:

i have login page , main page. login saving session in $_session in every page make session_start() , check if user loged looking $_session.

when login redirects me main page. when try login.php detects correctly im in , redirects main.php. when refresh main.php detects correctly session.

then, want make change in db use jquery function $.post send post data action.php , staff. action.php echo "true" $.post handler can detect change has been made correctly , redirect. action.php echo "false" $.post handler alert error ocured.

when make change db, gets done , echo true main.php refresh showing change instead of refresh come login.php losing session data.

here code:

start_session

function sec_session_start() {     $session_name = 'sec_session_id'; // set custom session name     $secure = false; // set true if using https.     $httponly = true; // stops javascript being able access session id.       ini_set('session.use_only_cookies', 1); // forces sessions use cookies.      $cookieparams = session_get_cookie_params(); // gets current cookies params.     //session_set_cookie_params($cookieparams["lifetime"], $cookieparams["path"],              $cookieparams["domain"], $secure, $httponly);     session_set_cookie_params(7200, "/", $cookieparams["domain"], $secure, $httponly);      session_name($session_name); // sets session name 1 set above.     session_start(); // start php session     session_regenerate_id(true); // regenerated session, delete old one.          } 

top of main.php , login.php , action.php

include('../db_connect.php'); include('../functions.php');  sec_session_start(); // our custom secure way of starting php session.   if(!login_check($mysqli)){     header('location: ../'); } 

javascript function post data action.php

function createteam(){      var serializeddata = $('#new_team_form').serialize();      $.post('action.php', serializeddata , function (resp) {         if(resp == "false"){             $('#exists').html("el grupo que intentas crear ya existe o ha habido un error en la petición.");         }else{             window.location ="./";         }     });     return false; //needs return false cause submit button of form } 

action.php - echoed return $.post()

<?php  include '../db_connect.php'; include '../functions.php';  sec_session_start(); // our custom secure way of starting php session.    $team = $_post['team']; $_session['user_id'] = $user_id;    if ($stmt = $mysqli->prepare("select name teams name = ? limit 1")) {          $stmt->bind_param('s', $team); // bind "$user_id" parameter.         $stmt->execute(); // execute prepared query.         $stmt->store_result();           if($stmt->num_rows == 1) {              echo "false1".$team;         } else {             //creamos el grupo en la base de datos y ponemos al usuario en dicho grupo              if ($stmt = $mysqli->prepare("insert teams (id, name) values (default, '$team')")) {                  $stmt->execute(); // execute prepared query.                 if($stmt = $mysqli->prepare("update  members set  team =  '".$team."'  members.id ='".$user_id."' limit 1 ")) {                     $stmt->execute(); // execute prepared query.                     echo "true";                 }else{                     echo "false2";                 }              }else{                 echo "false3";             }         }      } else {         echo "false4";      }  ?> 

what think & supposed answer problem

as trying mention main.php there no session transfer action.php except things running correctly ..

as reviewed code & know session work

//the session retrieve values on form of :

$_session['user_id'] = $user_id;

//and shifted page session retrieved :

$user_id = $_session['user_id'];

so think in action.php session not writes in retrieval values of syntax form try write down there

$user_id = $_session['user_id'];