new.php issue

<?php
error_reporting(-1);
ini_set('display_errors', 'On');
?>

<?php
    session_start();
    if(empty($_SESSION['loggedin']))
    {
        header('Location: http://' . $_SERVER['HTTP_HOST'] . '/sites/sgr/admin/login.php');
        exit;
    }

    echo 'You will only see this if you are logged in.';

	?>


<?php
/*
 NEW.PHP
 Allows user to create a new entry in the database
*/

 // creates the new record form
 // since this form is used multiple times in this file, I have made it a function that is easily reusable
function renderForm($id, $ref, $role, $division, $location, $salary, $description, $addedby,
$active, $error)
 {
 ?>

 <?php

include ( 'includes/header.php' );

?>
<title>Admin Add Job Page</title>
</head>
 <body>
 <div id="container">
 <?php
 // if there are any errors, display them
 if ($error != '')
 {
 echo '<div style="padding:4px; border:1px solid red; color:red;">'.$error.'</div>';
 }
 ?>

 <form action="" method="post">
 <div>
 <strong>Ref: *</strong> <input type="text" name="ref" value="<?php echo $ref; ?>" />
 <br/><br>
 <strong>Role: *</strong> <input type="text" name="role" value="<?php echo $role; ?>" />
 <br/><br>
 <strong>Division: *</strong> <input type="text" name="division" value="<?php echo $division; ?>" />
 <br /><br>
 <strong>Location: *</strong> <input type="text" name="location" value="<?php echo $location; ?>" />
 <br /><br>
 <strong>Salary: *</strong> <input type="text" name="salary" value="<?php echo $salary; ?>" />
 <br /><br>
 <strong>Description: *</strong> <textarea name="description" value="<?php echo $description; ?>" cols="30" rows="6" /></textarea>
 <br /><br>
 <strong>Added By: *</strong> <input type="text" name="addedby" value="<?php echo $addedby; ?>" />
 <br>
 <label style="color: #FFFFFF;"><input type="radio" name="active" value="1" <?php if($active == 1) echo 'checked="checked"'; ?> > Active</label>
<br>
<label style="color: #FFFFFF;"><input type="radio" name="active" value="0" <?php if($active == 0) echo 'checked="checked"'; ?> > Inactive</label>
<br>
 <input type="submit" name="submit" value="Submit">
 </div>
 </form>
 </div>
 </body>
 </html>
 <?php
 }

 // connect to the database
 //include('connect-db.php');
 $con = mysqli_connect("","","","");

 // check if the form has been submitted. If it has, start to process the form and save it to the database
 if (isset($_POST['submit']))
 {
 // get form data, making sure it is valid
 $id = $_POST['id'];
 $ref = mysql_real_escape_string(htmlspecialchars($_POST['ref']));
 $role = mysql_real_escape_string(htmlspecialchars($_POST['role']));
 $division = mysql_real_escape_string(htmlspecialchars($_POST['division']));
 $location = mysql_real_escape_string(htmlspecialchars($_POST['location']));
 $salary = mysql_real_escape_string(htmlspecialchars($_POST['salary']));
 $description = mysql_real_escape_string(htmlspecialchars($_POST['description']));
 $addedby = mysql_real_escape_string(htmlspecialchars($_POST['addedby']));
 $active = (int)$_POST['active'];

 // check to make sure all fields are entered
 if ($ref == '' || $role == '' || $division = '' || $location = '' || $salary = '' ||
 $description = '' || $addedby = '' || $active = '' )
 {
 // generate error message
 $error = 'ERROR: Please fill in all required fields!';

 // if either field is blank, display the form again
 renderForm($id, $ref, $role, $division, $location, $salary, $description, $addedby, $active, $error);
 }
 else
 {
 // save the data to the database
 mysqli_query($con, "INSERT INTO jobs (ref,role,division,location,salary,description,addedby,active) VALUES('$ref','$role','$division','$location','$salary','$description','$addedby','$active')")
 or die(mysql_error());

 // once saved, redirect back to the view page
 header("Location: view.php");
 }
 }
 else
 // if the form hasn't been submitted, display the form
 {
 renderForm('','','','','','','','','','');
 }
?>