How can you check if a radio button has been clicked in PHP form processing?

To check if a radio button has been clicked in PHP form processing, you can use the isset() function to determine if the radio button value has been set in the form data. If the radio button is clicked, its value will be submitted along with the form data. You can then check if the value exists in the $_POST or $_GET superglobal arrays to confirm if the radio button has been clicked. 

if(isset($_POST['radio_button_name'])){
    // Radio button has been clicked
    $selected_option = $_POST['radio_button_name'];
    // Process the selected option accordingly
} else {
    // Radio button has not been clicked
    // Handle this case as needed
}

Keywords

PHP radio button form processing isset $_POST

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