need some php help

adams · #1 25th Jun 03, 07:26 PM

bought a book to help me learn php. i type the code directly from the book and save it in the root directory on my computer, but then when i type in the address in my browser, the page will load but not work like it is supposed to.

here is the code for both pages. (its just a simple calculation script).
calculate.php:

Code:

<?
if (($_POST[val1] == "") || ($_POST[calc] =="")) {
header("Location: http://127.0.0.1/calculate_form.html");
exit;
}

if ($_POST[calc] == "add") {
	$result = $_POST[val1] + $_POST[val2];
} else if ($_POST[calc] == "subtract") {
	$result = $_POST[val1] - $_POST[val2];
} else if ($_POST[calc] == "multiply") {
	$result = $_POST[val1] * $_POST[val2];
} else if ($_POST[calc] == "divide") {
	$result = $_POST[val1] / $_POST[val2];
}
?>

<HTML>
<HEAD>
<TITLE> Calculation and Result</TITLE>
</HEAD>
<BODY>
<P>The result of the calculation is: <? echo "$result"; ?></P>
</BODY>
</HTML>

calculate_form.html:

Code:

<HTML>
<HEAD>
<TITLE>Calculation Form</TITLE>
</HEAD>
<BODY>

<FORM METHOD="POST" ACTION="calculate.php">
<P>Value 1: <INPUT TYPE="text" NAME="val1" SIZE=10></P>
<P>Value 2: <INPUT TYPE="text" NAME="val2" SIZE=10></P>
<P><Calculation:<br>
<INPUT TYPE="radio" NAME="calc" VALUE="add"> add<br>
<INPUT TYPE="radio" NAME="calc" VALUE="subtract"> subtract<br>
<INPUT TYPE="radio" NAME="calc" VALUE="multiply"> multiply<br>
<INPUT TYPE="radio" NAME="calc" VALUE="divide"> divide</P>
<P><INPUT TYPE="submit" NAME="submit" VALUE="Calculate"></P>
</FORM>
</BODY>
</HTML>

whenever i enter the two values in the blanks and choose to add (or whatever) and click submit, the page just reloads itself.
thanks in advance.