How can PHP be used to perform calculations based on user-selected dropdown menu options?

To perform calculations based on user-selected dropdown menu options in PHP, you can use JavaScript to capture the selected option and send it to a PHP script for processing. In the PHP script, you can use conditional statements to determine which calculation to perform based on the selected option, and then return the result back to the user. 

<?php
if(isset($_POST['selected_option'])){
    $selected_option = $_POST['selected_option'];
    
    switch($selected_option){
        case 'option1':
            // Perform calculation for option 1
            $result = 10 + 5;
            break;
        case 'option2':
            // Perform calculation for option 2
            $result = 20 - 5;
            break;
        case 'option3':
            // Perform calculation for option 3
            $result = 5 * 2;
            break;
        default:
            $result = "Invalid option selected";
    }
    
    echo $result;
}
?>

Keywords

PHP dropdown menu calculations user-selected options

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