How to make sure minimum QTY has been selected

[TCombs]

I'm working on a little shopping cart and my issue is this....

 

Some of the products available have a minimum quantity that must be reached before they can add it to the cart.

 

I have a field in the products table called "minimum".  When the admin adds a new product, he inputs the minimum required to order the item.

 

I need help figuring out how to write the code that checks to make sure the quantity entered meets the minimum quantity set in the products table.

 

My code is below:

<?php
session_start();

require("db.php");
require("functions.php");

$validid = pf_validate_number($_GET['id'], "redirect", $config_basedir);

$prodsql = "SELECT * FROM products WHERE id = " . $_GET['id'] . ";";
$prodres = mysql_query($prodsql);
$numrows = mysql_num_rows($prodres);
$prodrow = mysql_fetch_assoc($prodres);

$prodcatsql = "SELECT * FROM categories WHERE id = " . $_GET['id'] . ";";
$prodcatres = mysql_query($prodcatsql);
$bulkcat = mysql_num_rows($prodcatres);

if($numrows == 0)
{
	header("Location: " . $config_basedir);
}
else
{
		if($_POST['submit'])
		{
			if(!$_SESSION['SESS_ORDERNUM'])
			{
				if($_SESSION['SESS_LOGGEDIN'])
				{
					$sql = "INSERT INTO orders(customer_id, registered, date) VALUES(" . $_SESSION['SESS_USERID'] . ", 1, NOW())";
					mysql_query($sql);
					session_register("SESS_ORDERNUM");
					$_SESSION['SESS_ORDERNUM'] = mysql_insert_id();
				}
				else
				{
					$sql = "INSERT INTO orders(registered, date, session) VALUES(0, NOW(), '" . session_id() . "')";
					mysql_query($sql);
					session_register("SESS_ORDERNUM");
					$_SESSION['SESS_ORDERNUM'] = mysql_insert_id();
				}
			}

			foreach ($_POST as $name => $value) {
				if (substr($name, 0, 4) == 'qty_' && $value != '' && is_numeric($value)) {
					$arrOptions = explode('_', $name);

					$sizeid = $arrOptions[1];
					$colorid = $arrOptions[2];
					$quantity = $value;

					$itemsql = "INSERT INTO orderitems(order_id, product_id, size_id, color_id, quantity) VALUES (" . $_SESSION['SESS_ORDERNUM'] . ", " . $_GET['id'] . ", " . $sizeid . ", " . $colorid . ", " . $quantity . ")";
					mysql_query($itemsql);
				}
			}

			$totalprice = $prodrow['price'] * $_POST['amountBox'] ;

			$updsql = "UPDATE orders SET total = total + " . $totalprice . " WHERE id = " . $_SESSION['SESS_ORDERNUM'] . ";";
			mysql_query($updres);

			header("Location: " . $config_basedir . "showcart.php");
		}
		else
		{
				require("header.php");
				echo "<div id='adminhome'>";
				echo "<form action='addtobasket.php?id=" . $_GET['id'] . "' method='POST'>";

				echo "<table cellpadding='10' border='0'>";

				echo "<tr>";
					if(empty($prodrow['image'])) {
						echo "<td width='205'><img src='store-images/no-image-large.jpg' width='200' alt='" . $prodrow['name'] . "'>";
					}
					else
					{
						echo "<td width='205'>
						<img src='store-images/" . $prodrow['image'] . "' width='200' alt='" . $prodrow['name'] . "'>";
					}
					echo "</td>";

					echo "<td>";
					echo "<h1>";echo $prodrow['name'];echo "</h1>";
					echo "<h2>";echo $prodrow['description'];echo "</h2>";
					//echo "<pre>" . wordwrap( $prodrow['description'] , 30 ) . "</pre>";
					echo "<p>";echo $prodrow['details'];echo "</p>";

					echo "<br>";


					if($bulkcat==0)
					{
						echo "<div id='bulk1'>";
						echo "<table cellpadding='2' border='0'>";
						echo "<tr>";
						echo "<td>Quantity</td>";
						echo "<td>12</td>";
						echo "<td>24+</td>";
						echo "<td>48+</td>";
						echo "</tr>";
						echo "<tr>";
						echo "<td>Price</td>";
						echo "<td>$" . money_format('%i', $prodrow['price']) . "</td>";
						echo "<td>$" . money_format('%i', $prodrow['price2']) . "</td>";
						echo "<td>$" . money_format('%i', $prodrow['price3']) . "</td>";
						echo "</tr>";
						echo "</table>";
						echo "</div>";

						echo "<div id='bulk2'>";
						echo "<table cellpadding='2' border='0'>";
						echo "<tr>";
						echo "<br><div align='center'><strong>For Sizes 2XL - 5XL</strong></div>";
						echo "</tr>";
						echo "<tr>";
						echo "<td>Quantity</td>";
						echo "<td>12</td>";
						echo "<td>24+</td>";
						echo "<td>48+</td>";
						echo "</tr>";
						echo "<tr>";
						echo "<td>Price</td>";
						echo "<td>$" . money_format('%i', $prodrow['price4']) . "</td>";
						echo "<td>$" . money_format('%i', $prodrow['price5']) . "</td>";
						echo "<td>$" . money_format('%i', $prodrow['price6']) . "</td>";
						echo "</tr>";
						echo "</table>";
						echo "</div>";
					}
					else
					{
						echo "<div id='bulk1'>";
						echo "<table cellpadding='2' border='0'>";
						echo "<tr>";
						echo "<td>Quantity</td>";
						echo "<td>12</td>";
						echo "<td>24+</td>";
						echo "<td>48+</td>";
						echo "</tr>";
						echo "<tr>";
						echo "<td>Price</td>";
						echo "<td>$" . money_format('%i', $prodrow['price']) . "</td>";
						echo "<td>$" . money_format('%i', $prodrow['price2']) . "</td>";
						echo "<td>$" . money_format('%i', $prodrow['price3']) . "</td>";
						echo "</tr>";
						echo "</table>";
						echo "</div>";
					}




					echo "</td>";
					echo "</tr>";
					echo "</table>";

					echo '<div id="basketmatrix">';
					echo '<table cellpadding="1" border="1">';
					echo '<tr>';
					echo '<td></td>';

					$arrsizes = array();
					$i = 0;
					$result = mysql_query("SELECT DISTINCT s.id, s.size FROM sizes s INNER JOIN productoptions p ON s.id = p.sizeid WHERE p.productid = '" . $_GET['id'] . "' ORDER BY s.id");

					while ($row = mysql_fetch_assoc($result)) {
						echo '<td class="heading">' . $row['size'] . '</td>';

						$arrsizes[$i] = $row['id'];

						$i++;
					}

					echo '</tr>';

					$i = 0;
					$result = mysql_query("SELECT DISTINCT c.id, c.color FROM colors c INNER JOIN productoptions p ON c.id = p.colorid WHERE p.productid = '" . $_GET['id'] . "' ORDER BY c.id");

					while ($row = mysql_fetch_assoc($result)) {
						echo '<tr>';
						echo '<td class="heading">' . $row['color'] . '</td>';

						foreach ($arrsizes as $sizevalue) {
							echo '<td><input type="text" name="qty_' . $sizevalue . '_' . $row['id'] . '" size="5" /></td>';
						}
						echo '</tr>';
					}

					echo '</table>';
					echo '</div>';

					echo "<br>";
					echo "<br>";

					echo '<table>';
					echo '<tr>';
					echo '<td>';
					echo '<p>You MUST order a total of <font color="#ff0000"><strong>(' . $prodrow['minimum'] . ')</strong></font> or more to add this item to your cart.<br>';
					echo '(all colors + all sizes = total)</p>';
					echo '</td>';
					echo '<tr>';
					echo '<td>';
					echo"<input type='submit' name='submit' value='Add To Cart'>";
					echo '</td>';
					echo '</tr>';
					echo '</table>';

					echo "</form>";
					echo "</div>";


		}  
}

require("footer.php");
?>

[TCombs]

I know one of you php guru's knows how to resolve this  :-)