How can you determine which radio button was selected in a PHP form?

To determine which radio button was selected in a PHP form, you can check the value of the radio button input in the form submission data. Each radio button should have a unique value attribute, and the selected radio button's value will be included in the form data when the form is submitted. You can then use PHP to access this value and process it accordingly. 

```php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $selectedOption = $_POST["radio_option"];
    
    // Process the selected radio button option
    if ($selectedOption == "option1") {
        // Do something for option 1
    } elseif ($selectedOption == "option2") {
        // Do something for option 2
    } else {
        // Handle other cases
    }
}
```
In this code snippet, we check if the form has been submitted using the `$_SERVER["REQUEST_METHOD"]` variable. We then access the selected radio button's value using `$_POST["radio_option"]` and store it in a variable. Finally, we can process the selected option based on its value.

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