-1 php forms simple-form
我无法想象如何使这个简单的PHP表单起作用.我做错了什么？
<?php
$first = "firstNumber";
$second = "secondNumber";
$second * $first = "calc";
$calc = "calc";
echo("" . $_GET['$calc'] . "<br />\n");
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<form action="new.php" method="get">
<input type="text" name="firstNumber" id="first">
<input type="text" name="secondNumber" id="second">
<input style="background-color: #0094ff;" type="submit" name="calc" value="???" id="second">
</form>
</body>
</html>
我想你想要的东西
<?php
$first = $_GET["firstNumber"];
$second = $_GET["secondNumber"];
$calc = $second * $first;
echo $calc . "<br />";
?>
但是完整的,因为如果你运行它,你会收到警告,因为你没有发送表格
<?php
if(isset($_GET['calc'])) {
$first = $_GET["firstNumber"];
$second = $_GET["secondNumber"];
$calc = $second * $first;
echo $calc . "<br />";
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<form action="new.php" method="get">
<input type="text" name="firstNumber" id="first">
<input type="text" name="secondNumber" id="second">
<input style="background-color: #0094ff;" type="submit" name="calc" value="???" id="second">
</form>
</body>
</html>
http://codepad.viper-7.com/LZ7phd