PHP Quotation Calculator - php

Question

newbie here...
Im trying to create a simple php quote calculator, I've got a quantity field and 2 lest menus.
What I'm trying to do is multiply the quantity by a assigned value of the one list item added to quantity multiplied by an assigned value of the other list item, no combination of the two list items will be the same.
I've got this to work fine except once one of the list items is the same the calculation is thrown off...
if( isset( $_REQUEST['calculate'] ))
{
$type=$_REQUEST['type'] && $lam=$_REQUEST['lam'];
if($type=="One Side Colour" && $lam=="None")
{
$add1 = $_REQUEST['quantity'];
$res= $add1*.70+$add1*0;
}
if($type=="One Side Colour" && $lam=="One Side")
{
$add1 = $_REQUEST['quantity'];
$res= $add1*.70+$add1*.15;
}
if($type=="Two Sides Colour" && $lam=="None")
{
$add1 = $_REQUEST['quantity'];
$res= $add1*1.4+$add1*0;
}
the last "if" confuses the calculation
Any ideas to get around this?

Answer 1

Some code fix ups:
if( isset( $_REQUEST['calculate'] )){
$type = $_REQUEST['type'];
$lam = $_REQUEST['lam'];
$add1 = (int)$_REQUEST['quantity']; // Casts the value to Integer
if($type=="One Side Colour" && $lam=="None"){
$res = ($add1 * .70) + ($add1 * 0); // Unclear 0 * anything = 0
}
if($type=="One Side Colour" && $lam=="One Side"){
$res = ($add1 * .70) + ($add1 * .15);
}
if($type=="Two Sides Colour" && $lam=="None"){
$res = ($add1 * 1.4) + ($add1 * 0); // Another 0 issue?
}
}
Added a few ( ) to outline the order or operations. Also don't get why you multiply by 0...
Edit
After some of your comments, this would be condensed some:
if( isset( $_REQUEST['calculate'] )){
$type = $_REQUEST['type'];
$lam = $_REQUEST['lam'];
$add1 = (int)$_REQUEST['quantity'];
if($type == "One Side Colour") {
$res = ($add1 * .70) + ($add1 * ($lam == "One Side" ? .15 : 0));
} elseif($type == "Two Sides Colour") {
$res = ($add1 * 1.4);
}
}
Edit 2
Looked at your HTML and have a few suggestions:
<table width="450" cellpadding="5" border="0" align="center">
<tbody><tr>
<td>Quantity</td>
<td>
<input type="text" size="5" name="quantity" value="<?php echo (isset($_REQUEST['quantity'])?$_REQUEST['quantity']:''); ?>"> Business Cards</td>
</tr>
<tr>
<td>Number of Sides</td>
<td>
<select name="type">
<?php
$type = array(
"One Side Colour",
"Two Sides Colour",
"One Side Black/White",
"One Side Colour/Other Side Black/White"
);
foreach($type as $o){
if(isset($_REQUEST['type']) && $_REQUEST['type'] == $o){
echo " <option selected='selected'>$o</option\r\n";
} else {
echo " <option>$o</option>\r\n";
}
}
?>
</select></td>
</tr>
<tr>
<td>Lamination</td>
<td>
<select name="lam">
<?php
$lam = array(
"None",
"One Side",
"Both Sides"
);
foreach($lam as $l){
if(isset($_REQUEST['lam']) && $_REQUEST['lam'] == $l){
echo " <option selected='selected'>$l</option\r\n";
} else {
echo " <option>$l</option>\r\n";
}
?>
</select></td>
</tr>
<tr>
<td> </td>
<td><input type="Submit" value="calculate" name="calculate"></td>
</tr>
<tr><td>Price</td>
<td style="font-weight:bolder;font-size: 20px;"><?php echo (isset($res)?"P$res":""); ?></td>
</tr>
<tr>
</tr></tbody></table>
This will allow your form to retain the selections each time the price is calculated.

Answer 2

Hope this will help you...
if( isset( $_REQUEST['calculate'] )){
$type = $_REQUEST['type'];
$lam = $_REQUEST['lam'];
$add1 = (int)$_REQUEST['quantity'];
if($type == "One Side Colour") {
$res = ($add1 * .70) + ($add1 * ($lam == "One Side" ? .15 : 0));
} elseif($type == "Two Sides Colour") {
$res = ($add1 * 1.4);
}}
Also, I've created a calculator, regarding auto transport quote
If you need any help and code of that calculator than contact me.