SESSION NOT WORKING - HELP PLEASE

Language: PHP
session_start();	
  if (!(isset($_SESSION[';login';]) && $_SESSION[';login';] != "")) {	
  header ("Location:login.php");
}

Language: PHP
if ($result) {
      if ($num_rows > 0) {
      $_SESSION[';current';] = "1";
      header("Location: list.php");
      //$errorMessage = "Logged In";
      } 
else {
      //if not a member, re-direct to registration page.
      $_SESSION[';current';] = "";
      header("Location: register.php");
      $errorMessage = "Invalid Login";
      }

Language: PHP
session_start(); 
	//connect to the database
	include "connect.php";
	// Check if logged in = session is set 
		if (!isset($_SESSION[';current';]) && $_SESSION[';current';] != "") { 
			//echo "session not set";
			header("Location: login.php"); 
		}

Language: PHP
if ($result)  {
        if ($num_rows >0){
        session_start();
        $_SESSION [';current';] = "1";
        header("Location:insert.php");

Language: PHP
//if not a member, re-direct to registration page
session_start();
         $_SESSION [';current';] = ';';;
header("Location: register.php");
$errorMessage = "Invalid Login";

Language: PHP
<?php
 
  //check to see if the user is logged on
  session_start();
  if (!(isset($_SESSION[';current';]) && $_SESSION[';current';] != "")) {
	header ("Location:login.php");
  }
include(';connect.php';);  //connection details to database in a connect.php page