FIXED php checkbox array GET/POST

//Classes.php INITIAL TABLE OF CLASS CHOICES:
-------------------------------------------------------------------------------------------
  while ($row = mysqli_fetch_array($data)) {

    $new_date = $row['new_date'];
    $new_time = $row['new_time'];
    $venue = $row['venue'];

      echo '<tr><td>' . $new_date . '</td>';
      echo '<td>' . $new_time . '</td>';
      echo '<td>' . $venue . '</td>';
      echo '<td>' . $row['free_spaces'] . '</td>';
      echo '<form action="makebooking.php" method="get">';
      echo '<td><input type="checkbox" name="sesh[]" value="' . $row['class_id'] . '">';
      echo '<input type="hidden" name="date[]" value="' . $new_date . '" />';
      echo '<input type="hidden" name="time[]" value="' . $new_time . '" />';
      echo '<input type="hidden" name="venue[]" value="' . $venue . '" /></td></tr>';

    }
    echo'</table>';

    // Make booking button
      echo '<input type="submit" class="btn btn-large btn-primary pull-right" value="Book classes">';
      echo '</form>';
-------------------------------------------------------------------------------------------
//Makebooking.php $_GET AND $_POST TO REFLECT CHOICES AND ALLOW USER TO CONFIRM BEFORE UPDATING DB WITH BOOKING
-------------------------------------------------------------------------------------------
<?php

//Start the session
require_once('startsession.php');
require_once('connectvars.php');

//---------------------------------------------------------------------------------
    // Connect to the database
  $dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);

//---------------------------------------------------------------------------------
//Get user's ID from the users DB and set as $username
    $who = "SELECT first_name, last_name, user_id FROM users WHERE email = '" . $_SESSION['email'] . "'";
    $name = mysqli_query($dbc, $who);
    $row = mysqli_fetch_array($name);
    $username = $row['first_name'] . ' ' . $row['last_name'];

//If GET is set, grab the data and store it in variables

if (isset($_GET['sesh'])) {
   foreach ($_GET['sesh'] as $sesh) {
    $class_id = $_GET['sesh'];
    $date = $_GET['date'];
    $time = $_GET['time'];
    $venue = $_GET['venue'];
}

//---------------------------------------------------------------------------------
//If POST info if all set:
} else if (isset($_POST['date']) && isset($_POST['time']) && isset($_POST['venue']) && isset($_POST['username']) && isset($_POST['class_id'])) {

    foreach ($_POST['class_id'] as $classes) {
        $class_id = (int)$classes;
        $user_id = $_SESSION['user_id'];
    }
} else {
        echo'<p>Oops, something went wrong. Please <a href="classes.php">go back</a> and try again.</p>';
    }

//---------------------------------------------------------------------------------
//If the confirm button has been hit:
if (isset($_POST['submit'])) {

    //Create the foreach loop
    foreach ($_POST['class_id'] as $classes) {
        $class_id = (int)$classes;
    //UPDATE the bookings table;
         $query = "INSERT INTO bookings (user_id, booking_name, class_id, time_stamp) VALUES ('$user_id', '$username', '$class_id', NOW())";
        mysqli_query($dbc, $query);
    }
        mysqli_close($dbc);

        // REDIRECT
          $home_url = 'http://' . $_SERVER['HTTP_HOST'] . dirname($_SERVER['PHP_SELF']) . '/booking-confirmed.php';

          header('Location: ' . $home_url);


    }

else {

//Insert the page header
$page_title='Make a booking';
$description='Booking your Northallerton Zumba classes.';
require_once('header.php');

//html to set up the page layout
?>

<body>
<?php
//Insert the navigation bar
require_once('navbar.php');
//---------------------------------------------------------------------------------

//table header
echo '<table class="table table-bordered table-hover">';
  echo '<thead><tr><th>Date</th><th>Time</th><th>Venue</th><th>Who\'s going?</th><th>Add someone</th></tr></thead>';
//create the form
echo '<form method="post" action="' . $_SERVER['PHP_SELF'] . '">';


//Get the class IDs from the GET to use in the POST

    foreach ($_GET['sesh'] as $class_id) {

    $sql = "SELECT class_id, DATE_FORMAT(date, '%a, %d %b') AS new_date, DATE_FORMAT(time, '%H:%i') AS new_time, venue FROM classes WHERE class_id = '$class_id'";
    $data = mysqli_query($dbc, $sql);


//---------------------------------------------------------------------------------
//get table data
    while ($row = mysqli_fetch_array($data)) {
        $date = $row["new_date"];
        $time = $row["new_time"];
        $venue = $row["venue"];
        $class_id = $row["class_id"];
    }
    //---------------------------------------------------------------------------------
//Show a table of the selected classes

      echo '<td>' . $date . '</td>';
      echo '<td>' . $time . '</td>';
      echo '<td>' . $venue . '</td>';
      echo '<td>' . $username . '</td>';
      echo '<td><button class="btn btn-mini" type="button"><i class="icon-user"></i><i class="icon-plus"</i></button></td></tr>';
      echo '<input type="hidden" name="date[]" value="' . $date . '" />';
      echo '<input type="hidden" name="time[]" value="' . $time . '" />';
      echo '<input type="hidden" name="venue[]" value="' . $venue. '" />';
      echo '<input type="hidden" name="username[]" value="' . $username . '" />';
      echo '<input type="hidden" name="class_id[]" value="' . $class_id . '" />';

    }
 echo'</table>';

    //Go Back button
    echo '<a class="btn btn-link pull-left" href="classes.php"><i class="icon-arrow-left"></i> Go back</a>';

    // Make booking button
      echo '<input type="submit" name="submit" class="btn btn-large btn-primary pull-right" value="Confirm">';
      echo '</form>';
  }

//}
}
?>