How can PHP be used to calculate values based on user input from a form?

To calculate values based on user input from a form in PHP, you can use the $_POST superglobal to retrieve the user input values from the form fields. Then, perform the necessary calculations using these input values and display the result to the user. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $num1 = $_POST['num1'];
    $num2 = $_POST['num2'];
    
    $result = $num1 + $num2; // Perform the calculation
    
    echo "The result is: " . $result; // Display the result to the user
}
?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <input type="text" name="num1" placeholder="Enter number 1">
    <input type="text" name="num2" placeholder="Enter number 2">
    <button type="submit">Calculate</button>
</form>

Keywords

PHP form input calculation user input validation

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