How Can I Detect Whether My Total Price Is Greater Than The Price I Inputted On Textbox

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PHP

Hi i have a problem with my shopiing cart i hope you can help me with my problem.
I have a shopping cart which contains a session that i get when selecting values on database.
I have also a textbox which contains a desired budget.

My problem is I want to have a error message which can detect if the total price of the session is greater than the budget.

here is my code I hope you can help me
<form method="get">



Budget:
<input type="text" name="budget" class="txtfield" placeholder="Please enter your desired budget">


Service Type:

<select name="servicetype" class="txtfield">
<option>Wedding</option>
<option>Debut</option>
<option>Birthday</option>
</select>




<input type="submit" name="search" value="Search" class="btn btn-warning">


</form>

Desired Amount:


Please enter your desired amount';
}
else
{
$servicetype = $_GET['servicetype'];
$results = $mysqli->query("SELECT service_inclusion,price,servicetype,soid FROM service_offer
where servicetype='$servicetype' ORDER BY soid ASC");
if ($results)
{

while($obj = $results->fetch_object())
{

echo '';
echo '<form method="get" action="cart_update.php">';

echo ''.$obj->service_inclusion.'';
echo 'Price: '.$currency.$obj->price.' ';
echo 'Service Type: '.$obj->servicetype.' ';
echo '';
echo '<button style="background:#F01818; color:white;border:0;">Add Services</button>';
echo '';
echo '<input type="hidden" name="service_inclusion" value="'.$obj->service_inclusion.'" />';
echo '<input type="hidden" name="type" value="add" />';
echo '<input type="hidden" name="soid" value="'.$obj->soid.'" />';
echo '<input type="hidden" name="return_url" value="'.$current_url.'" />';
echo '</form>';
echo '';
}
}
}

?>

Your Shopping Cart
';
if($_GET['budget'] > $cart_itm['price'])
{
$message = 'error';
}
else
{
foreach ($_SESSION["products"] as $cart_itm)
{

echo '';
echo '×';
echo ''.$cart_itm["name"].'';
echo 'Price :'.$currency.$cart_itm["price"].'';
echo '';
$subtotal = ($cart_itm["price"]);
$Total = ($total + $subtotal);

}echo'';
echo 'Total : '.$currency.$Total.' Check-out!';
echo 'Empty Cart';
} }
else
{
echo 'Your Cart is empty';

}}
?>;
<script type="text/javascript">
</script>