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form3.php
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<!-- form3.php -->
<?php
// ここで送られてきたデータを受け取って使いやすいよう加工する
if (!isset($_GET['X']) or !isset($_GET['Y'])) {
if (!isset($_GET['X'])) {
$_GET['X'] = 0;
}
if (!isset($_GET['Y'])) {
$_GET['Y'] = 0;
}
}
if (!isset($_GET['CALC'])) {
$_GET['CALC'] = "足す";
}
$x = $_GET['X'];
$y = $_GET['Y'];
?>
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<title>form3.php</title>
</head>
<body>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
<form action="" method="GET" class="form-group m-5">
<p>X=</p>
<input type="text" name="X" size="4" maxlength="3" class="form-control" value="<?php echo $x; ?>">
<br />
<p>Y=</p>
<input type="text" name="Y" size="4" maxlength="3" class="form-control" value="<?php echo $y; ?>">
<br />
<input type="submit" name="CALC" value="足す" class="my-1 btn btn-primary form-control">
<input type="submit" name="CALC" value="引く" class="my-1 btn btn-primary form-control">
<input type="submit" name="CALC" value="かける" class="my-1 btn btn-primary form-control">
<input type="submit" name="CALC" value="割る" class="my-1 btn btn-primary form-control">
</form>
<hr />
<div class="m-5">
<p>Ans=</p>
<input type="text" readonly class="form-control" value="
<?php
if ($_GET['CALC'] == "足す") {
echo "${x} + ${y} = ".($x+$y);
} elseif ($_GET['CALC'] == "引く") {
echo "${x} - ${y} = ".($x-$y);
} elseif ($_GET['CALC'] == "かける") {
echo "${x} * ${y} = ".($x*$y);
} elseif ($_GET['CALC'] == "割る") {
echo "${x} / ${y} = ".($x/$y);
}
?>
">
</div>
</body>
</html>