我无法使用php中的Sessions将值从一个页面传递到另一个页面

I am a newbie in programming. I want to to fetch logged user id from database and store in SESSION and insert that session id in another table. I think I made my day but unfortunately there is an error which is driving me nuts. Any help would be appreciated!

Database btrs has table booking which have coulmn name

booking_id,customer_id,route_id

dbConfig.php

<?php
$dbhost = "localhost";      
$dbname = "btrs"; 
$dbuser = "root";           
$dbpass = "";               
$conn =mysql_connect($dbhost, $dbuser, $dbpass) or die("MySQL Error: " . mysql_error());
mysql_select_db($dbname) or die("MySQL Error: " . mysql_error());
?>

Logincheck.php

<?php
session_start();
include('dbConfig.php');
$error  =   ''; // Variable To Store Error Message
if (isset($_POST['submit'])) {
    if (empty($_POST['email']) || empty($_POST['password'])) {
        $error = "email or Password is invalid";
    }
    else {
        $email      =   $_POST['email'];
        $password   =   $_POST['password'];
        $email      =   stripslashes($email);
        $password   =   stripslashes($password);
        $email      =   mysql_real_escape_string($email);
        $password   =   mysql_real_escape_string($password);

        $query      =   mysql_query("select * from member where password='$password' AND email='$email'");
        $count      =   mysql_num_rows($query);
        if ($count > 0 ) {
            $row    =   mysql_fetch_array(mysql_query("select * from member where password='$password' AND email='$email'"));
             $id    =   $row['id'];
            // echo $id;
            $_SESSION['id']=$id;
            header("location: profile.php"); 
        } else {
            $error = "Username or Password is invalid";
        }
    }
}
?>

booking.php

<?php
include"dbConfig.php";
include "logincheck.php";
if (isset($_POST['submit'])) {
    $from1          =   $_POST['from'];
    $destination1   =   $_POST['destination'];
    $query          =   mysql_query("SELECT route_id FROM route WHERE pick_from='$from1' AND destination='$destination1'"); 
    $row            =   mysql_fetch_array($query); 
    $route_id       =   $row['route_id'];
    // echo $route_id;

    if ($row!=NULL) {
        $query1 =   "INSERT INTO booking(customer_id,route_id) VALUES ('".$_SESSION['id']."','$route_id')";
        if ($query1==1) {
            echo"very goodddd";
        }
    }
    else {
        echo "good";
    }
}
?>

You need to start session in profile.php file.

Add session_start(); in profile.php or booking.php at top of line, before include dbconfig file.

For every page where you want to create session variables and/or use session variables, you should start the very top of your code like this...

<?php
if (!isset($_SESSION)) {
  session_start();
}

Happy Coding !

In PHP you have to start session first.

So Use this code to start session.

session_start();

Visit this url for more reference.

http://php.net/manual/en/function.session-start.php