Problems with sessions and mysql - php

Question

i'm creating a site for a client and i get an error message saying "undefined index". I'm trying to upload data to a database from 3 multi form pages and they are handled by cv.php.
The form details are stored on page 2
<?php
session_start();
if(isset($_SESSION['FirstName'])){
$_SESSION['FirstName'] = $_POST['FirstName'];}
if(isset($_SESSION['LastName'])){
$_SESSION['LastName'] = $_POST['LastName'];}
if(isset($_SESSION['dob'])){
$_SESSION['dob'] = $_POST['dob'];}
if(isset($_SESSION['Age'])){
$_SESSION['Age'] = $_POST['Age'];}
if(isset($_SESSION['AddressLine1'])){
$_SESSION['AddressLine1'] = $_POST['AddressLine1'];}
if(isset($_SESSION['AddressLine2'])){
$_SESSION['AddressLine2'] = $_POST['AddressLine2'];}
if(isset($_SESSION['City'])){
$_SESSION['City'] = $_POST['City'];}
if(isset($_SESSION['County'])){
$_SESSION['County'] = $_POST['County'];}
if(isset($_SESSION['PostCode'])){
$_SESSION['PostCode'] = $_POST['PostCode'];}
if(isset($_SESSION['Country'])){
$_SESSION['Country'] = $_POST['Country'];}
if(isset($_SESSION['Telephone'])){
$_SESSION['Telephone'] = $_POST['Telephone'];}
if(isset($_SESSION['Mobile'])){
$_SESSION['Mobile'] = $_POST['Mobile'];}
if(isset($_SESSION['Email'])){
$_SESSION['Email'] = $_POST['Email'];}
?>
Page 3
<?php
session_start();
if(isset($_SESSION['Skills'])) {
$_SESSION['Skills'] = $_POST['Skills'];}
if(isset($_SESSION['ReasonApp'])){
$_SESSION['ReasonApp'] = $_POST['ReasonApp'];}
if(isset($_SESSION['WorkName'])){
$_SESSION['WorkName'] = $_POST['WorkName'];}
if(isset($_SESSION['WorkDesc'])){
$_SESSION['WorkDesc'] = $_POST['WorkDesc'];}
if(isset($_SESSION['W_AddressLine1'])){
$_SESSION['W_AddressLine1'] = $_POST['W_AddressLine1'];}
if(isset($_SESSION['W_AddressLine2'])){
$_SESSION['W_AddressLine2'] = $_POST['W_AddressLine2'];}
if(isset($_SESSION['W_City'])){
$_SESSION['W_City'] = $_POST['W_City'];}
if(isset($_SESSION['W_Telephone'])){
$_SESSION['W_Telephone'] = $_POST['W_Telephone'];}
?>
And my CV.php
<?
session_start();
ini_set('display_errors',1);
error_reporting(E_ALL);
//include connection profile
require_once("Sql/con.php");
include("config.php");
//declare variables with sessions
$FirstName = $_SESSION['FirstName'];
$LastName = $_SESSION['LastName'];
$dob = $_SESSION['dob'];
$Age = $_SESSION['Age'];
$AddressLine1 = $_SESSION['AddressLine1'];
$AddressLine2 = $_SESSION['AddressLine2'];
$PostCode = $_SESSION['PostCode'];
$City = $_SESSION['City'];
$County = $_SESSION['County'];
$Country = $_SESSION['Country'];
$Mobile = $_SESSION['Mobile'];
$Telephone = $_SESSION['Telephone'];
$Email = $_SESSION['Email'];
$Skills = $_SESSION['Skills'];
$ReasonApp = $_SESSION['ReasonApp'];
$SchoolName = $_SESSION['SchoolName'];
$Course = $_SESSION['Course'];
$Certificate = $_SESSION['Certificate'];
$DateFrom = $_SESSION['DateFrom'];
$DateTo = $_SESSION['DateTo'];
$CollName = $_SESSION['CollName'];
$CollQualification = $_SESSION['CollQualification'];
$CollYear = $_SESSION['CollYear'];
$WorkName = $_SESSION['WorkName'];
$WorkDesc = $_SESSION['WorkDesc'];
$W_AddressLine1 = $_SESSION['W_AddressLine1'];
$W_AddressLine2 = $_SESSION['W_AddressLine2'];
$W_PostCode = $_SESSION['PostCode'];
$W_City = $_SESSION['City'];
$W_Telephone = $_SESSION['Telephone'];
//database connection
$dblink = mysqli_connect($mysql_host,$mysql_user,$mysql_pw,$mysql_db) OR DIE ("Unable to
connect to database! Please try again later.");
//inserting information into tables
$order = "INSERT INTO CV_personal
(FirstName,LastName,dob,Age,AddressLine1,AddressLine2,PostCode,City,County,Country,Mobile,Telephone,Email,Skills,ReasonApp,SchoolName,Course,Certificate,DateFrom,DateTo,CollName,CollQualification,CollYear,WorkName,WorkDesc,W_AddressLine1,W_AddressLine2,W_City,W_Telephone)
VALUES
('$FirstName',
'$LastName',
'$dob',
'$Age',
'$AddressLine1',
'$AddressLine2',
'$PostCode',
'$City',
'$County',
'$Country',
'$Mobile',
'$Telephone',
'$Email',
'$Skills',
'$ReasonApp',
'$SchoolName',
'$Course',
'$Certificate',
'$DateFrom',
'$DateTo',
'$CollName',
'$$CollQualification',
'$ColYear',
'$WorkName',
'$WorkDesc',
'$W_AddressLine1',
'$W_AddressLine2',
'$W_PostCode',
'$W_City',
'$W_Telephone',)";
//declare in the order variable
$result = mysqli_query($dblink, $order); //order executes
?>
On my final page do i need to had my form into the session because i declared a variable for them on Cv.php ?
Thank you

Answer 1

In your first two blocks of code, you should be checking if the $_POST[...] is set, not the $_SESSION[...] because that it what you are assigning, so it won't cause an error.
On CV.php you should check whether the $_SESSION[...] exists before assigning it to a variable or else it WILL cause an error.
Tip:
If you are going to name your variables exactly the name of all your keys in the $_SESSION array. You can just substitute you many lines with this single line:
extract($_SESSION);
More on extract: http://www.php.net/extract