Есть 2 файла: calculate_form.html и calculate.php (пример из учебника)
calculate_form.html - форма, на которой 2 поля ввода, 4 радиобаттона
и дна кнопка, при нажатиии на которую должен выполняться скрипт calculate.php,
но выдается:
Notice: Use of undefined constant val1 - assumed 'val1' in D:\web\calculate.php on line 2
Warning: Cannot modify header information - headers already sent by (output started at D:\web\calculate.php:2) in D:\web\calculate.php on line 4
Чего ему надо???
-------------calculate_form.html-----------------------
<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>
-------------calculate_form.html-----------------------
-------------calculate.php-----------------------------
<?
if (($_POST[val1] == "") || ($_POST[val2] == "") || ($_POST[calc] == ""))
{
header("Location: http://127.0.0.1/calculate_form.html");
exit;
}
if ($_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] / $_POST[val2];
}
?>
<HTML>
<HEAD>
<TITLE>Calculation Result</TITLE>
</HEAD>
<BODY>
<P>The result of the calculation is: <? echo "$result"; ?></P>
</BODY>
</HTML>
-------------calculate.php-----------------------------
