Code
<!DOCTYPE html>
<html>
<head>
<title>Addition of Numbers Using Forms</title>
</head>
<body>
<?php $value1 = "";
$value2 = "";
$res="";
if (isset($_POST["add"])) {
$value1 = $_POST['val_1'];
$value2 = $_POST['val_2'];
if (is_numeric($value1) && is_numeric($value2)) {
$add = ($value1 + $value2);
$res = "<h3>The sum of $value1 and $value2 is $add </h3>";
} else {
$res = "<h3>The Value is not in Numbers </h3>";
}
}
if (isset($_POST["clear"])) {
$value1 = "";
$value2 = "";
}
?>
<h2> Sum of Two Numbers </h2>
<form method="POST">
Enter First Value
<br />
<input type="text" name="val_1" value="<?php echo "$value1"; ?>" />
<br />
Enter Second Value
<br />
<input type="text" name="val_2" value="<?php echo "$value2"; ?>"/>
<br>
<input type="submit" name="add" value="Add">
<input type="submit" name="clear" value="Clear" />
</form>
<?php
echo $res;
?>
</body>
</html>Output
Demo
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