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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title>Simple Form Calculator with PHP</title> <link rel='shortcut icon' href='../favicon.ico' type='image/x-icon' /> <?php /*************** Use PHP to calculate and update a form Dave Vogel - 4/26/01 dave@vogelnet.com When this page initially loads, the number of items and item total variable are initiallized to zero and show as zero on the form. Once number of items have been entered and the submit button is pushed this page is called again with all form fields sent as parameters. PHP automatically loads them into variables by the same name. The calculations are done and the form is updated with the values calculated. ***************/ /* This was originally written with register_globals defaulted to on. Added the following line to get the variables registered (still insecure). Should specify variables directly as per $_GET['clearButton'] */ extract($_GET); /*The PHP code is here in the head. Why? Why not? */ $taxRate = 0.08; if ($clearButton == "Clear") { /*If the clear button is pushed*/ for ($n=0; $n<3; $n++) { /*All the user form fields will be set to zero.*/ $number[$n] = 0; /*Are set to zero.*/ $itemCost[$n] = 0; /**/ } } $subTotal = 0; /*Initallize to zero*/ for ($n=0; $n<3; $n++) { /*Only 3 rows in this example*/ $itemTotal[$n] = $number[$n] * $itemCost[$n]; /*Each itemCost is the number of items time the price per item*/ $subTotal += $itemTotal[$n]; /*Sum the individual itemCosts for the grand total*/ $tax = $taxRate * $subTotal; $grandTotal = $subTotal + $tax; } ?> </head> <body> <h2>Form Arithmetic with PHP</h2> <h5>Enter values in the 'number of items' column and push the 'calculate' button</h5> <!-- Note that this form calls itself in the action attribute --> <form name="myForm" method="get" action="test_arithmetic.php"> <!-- Form fields placed in a table to format it --> <table border="0" cellpadding="0" cellspacing="0" summary="format form fields"> <tr> <th> </th> <th>Item Name</th> <th>Num<br>of<br>items</th> <th>Price per<br>Item</th> <th>Item Totals</th> </tr> <!-- Note that the number and itemTotal fields have 'default values provided by a PHP print command. The first time this page loads the variables that are printed are equal to zero. After the user updates the 'number of items' field and the form submitted, the above PHP code puts values in for the variables and the 'default' values for the text fields contain them. --> <tr> <td align="center" width="20">1</td> <td><input type="text" name="item" value="Coffee maker"></td> <td><input size="3" type="text" name="number[0]" value="<? print $number[0] ?>"></td> <td>$<input size="10" type="text" name="itemCost[0]" value="57.99"></td> <td>$<input type="text" name="itemTotal[0]" value="<?printf ("%6.2f", $itemTotal[0]) ?>"></td> </tr> <tr> <td align="center">2</td> <td><input type="text" name="item" value="Toaster"></td> <td><input size="3" type="text" name="number[1]" value="<? print $number[1] ?>"></td> <td>$<input size="10" type="text" name="itemCost[1]" value="39.99"></td> <td>$<input type="text" name="itemTotal[1]" value="<?printf ("%6.2f", $itemTotal[1]) ?>"></td> </tr> <tr> <td align="center">3</td> <td><input type="text" name="item" value="Blender"></td> <td><input size="3" type="text" name="number[2]" value="<? print $number[2] ?>"></td> <td>$<input size="10" type="text" name="itemCost[2]" value="29.99"></td> <td>$<input type="text" name="itemTotal[2]" value="<?printf ("%6.2f", $itemTotal[2]) ?>"></td> </tr> <tr> <td colspan=4 align="right">Subtotal - </td> <td>$<input type="text" name="subTotal" value="<? printf ("%6.2f", $subTotal) ?>"></td> </tr> <tr> <td colspan=4 align="right">Tax - </td> <td>$<input type="text" name="tax" value="<? printf ("%6.2f", $tax) ?>"></td> </tr> <tr> <td colspan=4 align="right">Total - </td> <td>$<input type="text" name="grandTotal" value="<? printf ("%6.2f", $grandTotal) ?>"></td> </tr> </table> <input type="submit" value="Calculate" name="submitButton"> <input type="submit" value="Clear" name="clearButton"> </form> </body> </html>