php-learning-path/calculator.php at main · pratibhasingh47/php-learning-path · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width= , initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post" >
        <input type="number" name="num01" placeholder="Number one" required>
        <select name="operator">
            <option value="add">+</option>
            <option value="subtract">+</option>
            <option value="multiply">*</option>
            <option value="divide">/</option>
        </select>
        <input type="number" name="num02" placeholder="Number two" required>
        <button>Calculate</button>
    </form>

    <?php

        if($_SERVER["REQUEST_METHOD"] == "POST"){
            $num01 = filter_input(INPUT_POST,"num01",FILTER_SANITIZE_NUMBER_FLOAT);
            $num02 = filter_input(INPUT_POST,"num02",FILTER_SANITIZE_NUMBER_FLOAT);
            $operator = htmlspecialchars($_POST["operator"]);

            $errors = false;

            if(empty($num01) || empty($num02) || empty($operator)){
                echo "Fill in all Fields";
                $errors = true;
            }

            if(!is_numeric($num01) || !is_numeric($num02)){
                echo "Plz enter number";
                $errors =true;
            }

            if(!$errors){
                $value = 0;
                switch($operator){
                    case "add":
                        $value = $num01 + $num02;
                        break;
                    case "subtract":
                        $value = $num01 - $num02;
                        break;
                    case "multiply":
                        $value = $num01 * $num02;
                        break;
                    case "divide":
                        $value = $num01 / $num02;
                        break;
                    default :
                        echo "Something went wrong!";
                };

                echo "<p>Result =  $value </p>";
            }
        }
    ?>

</body>
</html>