Simple Calculator - PHP - Code Examples

<!DOCTYPE html>
<html>
<head>
    <title>PHP Calculator</title>
</head>
<body>

<h2>Simple PHP Calculator</h2>

<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
    <label for="num1">Number 1:</label>
    <input type="text" id="num1" name="num1" required><br><br>

    <label for="num2">Number 2:</label>
    <input type="text" id="num2" name="num2" required><br><br>

    <label for="operator">Choose an operator:</label>
    <select id="operator" name="operator">
        <option value="+">Addition (+)</option>
        <option value="-">Subtraction (-)</option>
        <option value="*">Multiplication (*)</option>
        <option value="/">Division (/)</option>
    </select><br><br>

    <input type="submit" value="Calculate">
</form>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $num1 = $_POST["num1"];
    $num2 = $_POST["num2"];
    $operator = $_POST["operator"];

    switch ($operator) {
        case "+":
            $result = $num1 + $num2;
            break;
        case "-":
            $result = $num1 - $num2;
            break;
        case "*":
            $result = $num1 * $num2;
            break;
        case "/":
            if ($num2 != 0) {
                $result = $num1 / $num2;
            } else {
                $result = "Cannot divide by zero!";
            }
            break;
        default:
            $result = "Invalid operator!";
    }

    echo "<h3>Result: $result</h3>";
}
?>

</body>
</html>
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