How can a user select a number and display a calculation on the same page in PHP?

To allow a user to select a number and display a calculation on the same page in PHP, you can use a form with a dropdown menu for number selection and then process the calculation on the same page using PHP. You can use a conditional statement to check if the form has been submitted and then perform the calculation based on the selected number. 

<?php
if(isset($_POST['submit'])){
    $number = $_POST['number'];
    $result = $number * 2; // Perform a simple calculation, e.g., multiply the selected number by 2
    echo "The result of the calculation is: " . $result;
}
?>

<form method="post">
    <label for="number">Select a number:</label>
    <select name="number" id="number">
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
    </select>
    <button type="submit" name="submit">Calculate</button>
</form>

Keywords

user input form submission PHP calculation dynamic content DOM manipulation

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