[SOLVED] Coding help is needed

[tauchai83]

I have the following code:

<?php

if(isset($_SESSION['items_in_sale'])){
    	$num_items=count($_SESSION['items_in_sale']);

	$_POST['item'] = strtoupper($_POST['item']);



		if (count($_SESSION['items_in_sale'])>0){
		   
		  for($k=0;$k<$num_items;$k++)
			{
				$item_info=explode(' ',$_SESSION['items_in_sale'][$k]);
				$item_id=$item_info[0];
				  

				if (($item_id == $_POST['item'])) {
					$AllowUpdate = False;
					echo 'The item' . ' ' . strtoupper($_POST['item']) . ' ' . 'is already on this order' . ' - ' . 'the system will not allow the same item on the list more than once' . '. ' . 'However you can change the quantity by selecting it from the list';
				} //item id==posted item id
			  
			} //end for loop
		}//count
	}//isset





?>

 

I would like to disallow the user from entering the same ITEM on the sales he is making. If the ITEM entered is the same, then they can only update the quantity from the current row of ITEM shown on the screen. I don want the same item appear twice. But my problem is when i enter the different item, it will show the error message, stating I already enter the item twice. Could someone please help me on this coding?

 

I need different approach. I'm lost!

[btherl]

Try printing out the values you are comparing inside the for loop.  You may find something you don't expect, which will lead you in the right direction to fixing it.

 

You might also want to print_r($_SESSION) or var_dump($_SESSION)

 

Based on only the code you gave, I can't give any specific advice, because there is not enough information.

[tauchai83]

the VALUE of the item is the same.

 

for eg, 00001 00001. I did echo it to see whether they are the same. Basically the array value all pass well. Only the method of programming that might wrong.

 

<?php

echo "<center>New Sales</center>";



if(isset($_POST['item']))
{
	$item=$_POST['item'];
	$AllowUpdate = True; /*always assume the best */
	$discount='0%';

	$sql		="select * from product where pd_barcode='$item'";
	$result		=mysql_query($sql);
	$row 		=mysql_fetch_assoc($result);
	$itemPrice	= $row['pd_price'];
	$pd_qty		=$row['pd_qty'];




			if(mysql_num_rows($result)>0)

			{

				if($pd_qty==0){
				echo '<br><br><center><b>Out of Stock! Please Reorder this item</b></center>';
				exit();
				}
				$_SESSION['items_in_sale'][]=$item.' '.$itemPrice.' '.'1';


/*$item_info=explode(' ',$_SESSION['items_in_sale'][$k]);
$item_id=$item_info[0];
foreach ($item_info as $OrderItem) { /*now test for the worst */
				/* do a loop round the items on the order to see that the item
				is not already on this order */
                 


			}
			else
			{
			echo "<center><b>Please enter a valid Item ID!</b></center>";
			}

}

	if(isset($_SESSION['items_in_sale'])){
    	$num_items=count($_SESSION['items_in_sale']);
 	//if ($_POST['item']!='' AND $AllowUpdate==True){  //A stock item has been entered - skip if inputs crook

			$_POST['item'] = strtoupper($_POST['item']);



		if (count($_SESSION['items_in_sale'])>0){
		   
		  for($k=1;$k<$num_items;$k++)
			{
				$item_info=explode(' ',$_SESSION['items_in_sale'][$k]);
				$item_id=$item_info[0];
				  

				if (($item_id == $_POST['item'])) {
					$AllowUpdate = False;
					echo 'The item' . ' ' . strtoupper($_POST['item']) . ' ' . 'is already on this order' . ' - ' . 'the system will not allow the same item on the order more than once' . '. ' . 'However you can change the quantity by selecting it from the order summary';
				} //item id==post item id
			  
			} //end for loop
		}//count
	}//post item and allow update?

	echo $_POST['item']; //try check the value whether it was matched. YES.it matched.
	echo $item_id;



if(isset($_SESSION['items_in_sale']))
{
	$num_items=count($_SESSION['items_in_sale']);

}
else
{
	$num_items=0;
}	
$temp_item_name='';
$temp_item_id='';
$temp_quantity='';
$temp_price='';
$finalSubTotal=0;
$finalTotal=0;
$totalItemsPurchased=0;

$item_info=array();



echo "<hr><center><a href=delete.php?action=all>Clear Sale</a></center>";


echo "<center><form name='select_item' action='sale_ui.php' method='POST'>
	<table border='0' bgcolor='#FFCCFF' align='center'>
<table><tr><td>
<font color='black'><b>Item Barcode: </b></font><input type='text' name='item' size=20'>
<input type='submit'></form></td></tr>


</table>";



echo "<h3 align='center'>List of Items</h3>

<form name='add_sale' action='addsale.php' method='POST'>";
echo "<table border='0' bgcolor='#FFCCFF' cellspacing='0' cellpadding='2' align='center'>
<tr><th>Remove</font></th>
<th>Item Name</font></th>
<th>Unit Price</font></th>
<th>Quantity</font></th>
<th>Total Price</font></th>
<th>Update</font></th>	

</tr>";


for($k=0;$k<$num_items;$k++)
{
	$item_info=explode(' ',$_SESSION['items_in_sale'][$k]);
	$temp_item_id=$item_info[0];

	$sql2="SELECT pd_name FROM product WHERE pd_barcode='$temp_item_id'";
	$result2=mysql_query($sql2);
	$row2=mysql_fetch_assoc($result2);
	$name= $row2['pd_name'];
	$temp_item_name= $name;

	$temp_price=$item_info[1];
	$temp_quantity=$item_info[2];
	$temp_discount=$item_info[3];

	$subTotal=$temp_price*$temp_quantity;
	$rowTotal=$subTotal;
	$rowTotal=number_format($rowTotal,2,'.', '');

	$finalSubTotal+=$subTotal;

	$totalItemsPurchased+=$temp_quantity;

	echo "<tr><td align='center'><a href=delete.php?action=item&pos=$k><font color=black>Delete</font></a></td>
			  <td align='center'><font color='black'><b>$temp_item_name</b></font></td>
			  <td align='center'><input type=text name='price$k' value='$temp_price' size='8'></td>
			  <td align='center'><input type=text name='quantity$k' value='$temp_quantity' size='3'></td>

			  <td align='center'><font color='black'><b>RM $rowTotal</b></font></td>
			  <td align='center'><input type='button' name='updateQuantity$k' value='update' onclick=\"document.add_sale.action='sale_ui.php?update_item=$k';document.add_sale.submit();\"></td>

			  <input type='hidden' name='item_id$k' value='$temp_item_id'>
			  </tr>";
}


$finalSubTotal=number_format($finalSubTotal,2,'.', '');


echo '</table>';


echo "<table align='center' ><br>
<tr><td align='left'><b>Sale SubTotal: RM $finalSubTotal</b></td></tr>";





echo "<br><table border='0' bgcolor='#FFCCFF' align='center'>
<tr>
<td>
<font color='black'>Paid With:</font> 
</td>
<td>
<select name='paid_with'>
<option value='cash'>cash</option>
<option value='check'>check</option>
<option value='credit'>credit</option>

</select>
<font color='black'>Aount Tendered:<input type='text' name='amt_tendered'></font>
</td>
</tr>
<tr>
<td>
<font color='black'>Sale Comment:</font>
</td>
<td>
<input type=text name=comment size=25>
</td>
</tr>

</table>
  <br>
  	  <input type=hidden name='totalItemsPurchased' value='$totalItemsPurchased'>
  	  <input type=hidden name='finalSubTotal' value='$finalSubTotal'>
  <input type=hidden name='confirm' value='1'>
  <center><input type='submit' value='Add Sale'></center></form>";		



  








?>

 

 

Here is the information that you need. Please advise and correct where was my mistake. Thanks.

[btherl]

I believe the problem may be that you add the item to $_SESSION['items_in_sale'] before you check for duplicates.

 

Also, $k should start at 0 (as in the first code you posted), not 1.  You can check this by using var_dump($_SESSION['items_in_sale']).  That will show you that the first array index is 0.

[tauchai83]

u know why start with 1? bcoz the 0 means the first item entered by user wont be duplicate...u got my point? haha

[tauchai83]

OK. I guess I know where was the mistake. Thanks a lot for your advise. 

[boo_lolly]

i was adding a feature to a shopping cart i was building that was similar:

http://www.phpfreaks.com/forums/index.php/topic,134201.msg584133.html#msg584133

 

it'd probably be best if you read the whole topic from beginning to end.