Calcolatrice php by @garghy64 - Codewith.it

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<html lang="it">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Calcolatrice php</title>
    <link rel="stylesheet" href="styles.css">
  </head>
  <body>
    <div class="calculator">
        <input type="text" class="display" id="display" disabled>
        <div class="buttons">
            <button value="1">1</button>
            <button value="2">2</button>
            <button value="3">3</button>
            <button value="+">+</button>
            <button value="4">4</button>
            <button value="5">5</button>
            <button value="6">6</button>
            <button value="-">-</button>
            <button value="7">7</button>
            <button value="8">8</button>
            <button value="9">9</button>
            <button value="*">*</button>
            <button value="C">C</button>
            <button value="0">0</button>
            <button value="=">=</button>
            <button value="/">/</button>
        </div>
    </div>
  </body>
</html>

body {
    display: flex;
    justify-content: center; 
    align-items: center; 
    height: 100vh; 
    margin: 0;
    background-color: #f4f4f4; 
    font-family: Arial, sans-serif; 
}

.calculator {
    background-color: #333; 
    padding: 20px; 
    border-radius: 10px; 
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1); 
}

#display {
    width: 100%;
    height: 50px;
    background-color: #222; 
    color: #fff; 
    border: none; 
    text-align: right; 
    padding: 10px; 
    font-size: 24px; 
    border-radius: 5px; 
    margin-bottom: 10px; 
}

.buttons {
    display: grid; 
    grid-template-columns: repeat(4, 1fr); 
    gap: 10px; 
}

button {
    background-color: #444; 
    color: #fff; 
    border: none; 
    padding: 20px; 
    font-size: 18px; 
    border-radius: 5px; 
    cursor: pointer; 
    transition: background-color 0.3s; 
}

button:hover {
    background-color: #555; 
}

button.zero {
    grid-column: span 2; 
}

<?php 
if (isset($_POST['calculate'])) {
    $previousInput = $_POST['previousInput'] ?? '';
    $currentInput = $_POST['currentInput'] ?? '';
    $operator = $_POST['operator'] ?? '';
    $result = '';

    if ($previousInput !== '' && $currentInput !== '' && $operator !== '') {
        switch ($operator) {
            case '+':
                $result = $previousInput + $currentInput;
                break;
            case '-':
                $result = $previousInput - $currentInput;
                break;
            case '*':
                $result = $previousInput * $currentInput;
                break;
            case '/':
                if ($currentInput != 0) {
                    $result = $previousInput / $currentInput;
                } else {
                    $result = "Error: Division by zero";
                }
                break;
        }
        $previousInput = $result;
        $currentInput = '';
        $operator = '';
    }
} else if (isset($_POST['clear'])) {
    $currentInput = '';
    $previousInput = '';
    $operator = '';
    $result = '';
} else if (isset($_POST['digit'])) {
    $digit = $_POST['digit'];
    $currentInput .= $digit;
    $result = ''; // Clear result when a new digit is entered
} else if (isset($_POST['operation'])) {
    $operation = $_POST['operation'];
    if ($currentInput !== '') {
        $previousInput = $currentInput;
        $operator = $operation;
        $currentInput = '';
        $result = ''; // Clear result when an operator is selected
    }
}
?>