传递变量值php

there is 2 pages , one is the main and the other included to it

the main page

<?php
$var_value = 7;
$_SESSION['varname'] = $var_value;
include 'upload_image.php';
?>

and the included page

<?php
include 'init.php';

if (!logged_in()) {
header('Location: index.php');
exit();
} 

include 'template/header.php';  
?>

<h3>Upload image</h3>

<?php

if (isset($_FILES['image'], $_POST['image_n'], $_POST['image_description'])) {
$image_name = $_FILES['image']['name'];
$bytes = $_FILES['image']['size'];
$image_temp = $_FILES['image']['tmp_name'];
$image_n = $_POST['image_n'];
$image_description = $_POST['image_description'];

$allowed_ext = array('jpg', 'jpeg', 'png', 'gif', 'rar', 'pdf');
//$image_ext = strtolower(end(explode('.', $image_name)));

$image_ext = pathinfo($image_name, PATHINFO_EXTENSION);

$album_id = $_SESSION['varname'];

$errors = array();

if (empty($image_name) || empty($album_id) || empty($image_n) ||         empty($image_description)) {

    $errors[] = 'Something is missing';
} else {

if (strlen($album_name) > 55 || strlen($album_description) > 255) {
        $errors[] = 'One or more fields contains too many characters';
    }

if (in_array($image_ext, $allowed_ext) === false) {
    $errors[] = 'File type not allowed';

}

//if ($image_size > 2097152) {
//  $errors[] = 'Maximum file size is 2mb';
//}

if (album_check($album_id) === false) {
    $errors[] = 'Couldn\'t upload to that album';
}

}

if (!empty($errors)) {
    foreach ($errors as $error) {
        echo $error, '<br />';
    }

} else {
    $byte = formatSizeUnits($bytes);
    upload_image($image_temp, $image_ext, $album_id, $image_n, $image_description, $byte);
    header('Location: view_album.php?album_id='.$album_id);
    exit();
}
}

$albums = get_albums();

if (empty($albums)) {
echo'<p>You don\'t have any albums. <a href="create_album.php">Create an album</a></p>';
} else {
?>

<form action="" method="post" enctype="multipart/form-data">
<div class="choose">
    <p>Choose a file:<br /><input type="file" name="image" /></p>
    </div>
        <div class="des">
        <p>Name*:<br /><input type="text" name="image_n" maxlength="55"/></p>
        <p>Description*:<br /><textarea name="image_description" rows="6" cols="35" maxlength="255"></textarea></p>


    <p><input type="submit" value="Upload" /></p>
    </div>
</form>
<div class="foot">
<?php   
}

include 'template/footer.php';  
?>
</div>

the form at the end of the second page does not load .. but when i delete the first line at the main page $var_value = 7 ; the form at the end load .. i don't know what is the problem or there is other way to set the album value in the main and pass it to the included page

If there are no problems found in $album_id, which is set from $var_value, the included file does:

$byte = formatSizeUnits($bytes);
upload_image($image_temp, $image_ext, $album_id, $image_n, $image_description, $byte);
header('Location: view_album.php?album_id='.$album_id);
exit();

So it never gets to the part that displays the form.

The second code is included? If so than you can just use

$album_id = $var_value 

Instead of:

$album_id = $_SESSION['varname'];

in the second peace of code... No need for an session.