01-12-2010, 05:54 AM
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#3 (permalink)
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The Wanderer
Join Date: Dec 2009
Posts: 17
Thanks: 2
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What I would Do
This is how I would do it. ITs well commented to help you along. Let me know if yo have any questions. I hope it works 
PHP Code:
<?php
/*
* General Notes:
*
* I personally avoid using the extract() function for dealing with queries. It makes
* variables pop out of no where and the code becomes harder to read, both for third
* parties and yourself at a later date. I prefer doing $mysql_returned_array["database_field"]
*
*/
session_start();
require_once 'lib/database.php';
function get_shopping_cart(){
$shopping_cart = array();
$sid = session_id();
$query2 = "SELECT c.item_no
FROM cart c
WHERE c.session_id = $sid";
$result2 = mysql_query($query2);
if(mysql_num_rows($result2) > 0){
while($cart_row = mysql_fetch_array($result2)){
$shopping_cart[$cart_row['item_no']] = true;
}
}
return $shopping_cart;
}
$main_error_message = "";
$updated_items = 0;
$inserted_items = 0;
///get all colors from the database, set to array
$all_colors = array();
$query = "SELECT mc.color_no, mc.color_name, mc.hex, mc.font, mc.series, pd.size, pd.retail, pd.price, pd.qty, pd.item_no
FROM product pd
INNER JOIN mfg_color mc
ON pd.color_id = mc.color_id";
$result = mysql_query($query);
if(mysql_num_rows($result) > 0){
while($color_array = mysql_fetch_array($result)){
$all_colors[$color_array['color_id']] = $color_array;
}
}
//was anything posted this page load?
if($_POST["post_flag"] == 1){
//set a boolean here to keep track of weather or not we have sufficient quantity in stock
$sufficient_quantity = true;
//something was posted, so lets loop through each color once to make sure we have enough in stock of everything they requested
foreach($all_colors as $one_color){
//instead of extract, we will manually set variables here
$color_id = $one_color["color_id"];
$quantity = $one_color["qty"];
//note the use of the color_id to identify the quantity field instead of $i. Using $i makes it hard because it is an arbitrary number and forces you to do more work and write more confusing code.
$postqty = $_POST["qty".$color_id];
//did they order more than we have of this color?
if($postqty > $quantity){
//uh-oh, they asked for more than we have of this color. lets handle the error.
$all_colors[$color_id]["error_message"] = "*Only $quantity In Stock.";
//set our flag so we know not to process this order
$sufficient_quantity = false;
}
}
//now, lets see if we have enough quantity to update the shopping cart
if($sufficient_quantity){
//we have enough. lets process the order
//first, lets get the contents of their cart
$shopping_cart = get_shopping_cart();
//now, we'll loop through all colors again, this time either inserting into the cart or updating its quantities
foreach($all_colors as $one_color){
//instead of extract, we will manually set variables here
$color_id = $one_color["color_id"];
$quantity = $one_color["qty"];
$item_no = $one_color["item_no"];
$sid = session_id();
//note the use of the color_id to identify the quantity field instead of $i. Using $i makes it hard because it is an arbitrary number and forces you to do more work and write more confusing code.
$postqty = $_POST["qty".$color_id];
//did they order this color?
if($postqty > 0){
//they did order it. is it in their cart already?
if($shopping_cart[$item_no] == true){
//its in the cart, lets update qunatity
$update_cart = "UPDATE `lashelles`.`cart`
SET cart_qty = cart_qty + $postqty
WHERE item_no = $item_no AND session_id = $sid";
if(mysql_query($update_cart)){
$updated_items++;
}
}
else{
//its not in the cart, lets insert it.
$update_cart = "INSERT INTO `lashelles`.`cart` (`cart_id`, `item_no`, `cart_qty`, `session_id`, `date`)
VALUES (NULL, '$item_no', '$postqty', '$sid', NOW());";
if(mysql_query($update_cart)){
$inserted_items++;
}
}
}
}
}
else{
//not enough quantity. we will not update cart.
$main_error_message = "Error: We lacked the quantities required to update your cart";
}
}
echo $main_error_message;
echo "Updated $updated_items Items and Inserted $inserted_items Succesfully!";
?>
<!-- just so you know, you're missing some HTML here :-) -->
<head>
<link rel="stylesheet" type="text/css" media="screen" href="include/screen.css">
</head>
<form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post">
<!--
Its nice to add a post flag sometimes, that way we only enter the php code
to handle the post if the user actually posted something
-->
<input type="hidden" name="post_flag" value="1">
<table id="colorchart" cellpadding="0" cellspacing="0">
<tr style="background:#CCCCCC;">
<th>No.</th>
<th>Color</th>
<th>Series</th>
<th>Size</th>
<th> </th>
<th>Price</th>
<th>Avail.</th>
<th style="text-align:right; padding-right:25px;">Qty.</th>
</tr>
<!-- finaly, we will loop once more and display everything -->
<?php
$c = 0;
foreach($all_colors as $one_color):
$c++;
//i normally wouldnt use extract here either, im just lazy right now
extract($one_color);
?>
<tr <?=($c % 2 ==0) ? "class=\"light\" " : "class=\"dark\" " ?>>
<td><?=$color_no ?></td>
<td style="background:#<?=$hex ?>; color:#<?=($font == 'W') ? $font = "FFFFFF" : $font = "000000"?>;"><?=$color_name ?></td>
<td><?=$series ?></td>
<td><?=$size ?></td>
<td class="retail">List: $<?=$retail ?></td>
<td>$<?=$price ?></td>
<td><?=$qty ?></td>
<td style="text-align:right;"><input type="text" size="3" value="$value" name="qty$color_id" style="border:1px solid;"/>$error_message</td>
</tr>
<?php endforeach; ?>
<tr>
<td colspan="8" style="border:0; text-align:right;">
<input class="addtocart" type="submit" value="ADD TO CART" name="addtocart" />
</td>
</tr>
</table>
</form>
All Done!
<?php
/*
* Begin old code
$qtycheck = 0;
for ($i = 0; $i < $rows; ++$i) {
extract(mysql_fetch_array($result));
$postqty = $_POST["qty$i"];
if ($postqty > $qty) {
$red = 'red';
$qtycheck += 1;
$stockerror = "<br /><span class='stockerror'>*Only <span class='qty'>$qty</span> In Stock</span>";
}
elseif ($postqty > 0) {
$red = '';
$stockerror = '';
$sid = session_id();
$query2 = "SELECT c.item_no
FROM cart c
WHERE c.item_no = $item_no AND c.session_id = $sid";
$result2 = mysql_query($query2);
if (mysql_num_rows($result2) == 0) {
$update_cart = "INSERT INTO `lashelles`.`cart` (`cart_id`, `item_no`, `cart_qty`, `session_id`, `date`)
VALUES (NULL, '$item_no', '$postqty', '$sid', NOW());";
mysql_query($update_cart);
}
else {
$update_cart = "UPDATE `lashelles`.`cart`
SET cart_qty = cart_qty + $postqty
WHERE item_no = $item_no AND session_id = $sid";
mysql_query($update_cart);
}
(mysql_query($update_cart)) ? $postqty = '' : $postqty;
}
else {
$red = '';
$stockerror = '';
}
($postqty == '') ? $value = 0 : $value = $postqty;
($i % 2 == 1) ? $alt = "DDDDDD" : $alt = "FFFFFF";
($font == 'W') ? $font = "FFFFFF" : $font = "000000";
echo <<<_END
<tr style="background:#$alt;">
<td>$color_no</td>
<td style="background:#$hex; color:#$font;">$color_name</td>
<td>$series</td>
<td>$size</td>
<td class="retail">List: $$retail</td>
<td>$$price</td>
<td>$qty</td>
<td style="text-align:right;"><input type="text" size="3" value="$value" name="qty$color_id" style="border:1px solid $red;"/>$stockerror</td>
</tr>
_END;
}
* end old code
*/
?>
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