What are some common mistakes to avoid when handling radio buttons in PHP forms?

One common mistake when handling radio buttons in PHP forms is not properly checking if a radio button is selected before processing the form data. To avoid this mistake, always ensure that you check if the radio button is set in the $_POST array before using its value in your code. This can prevent errors and ensure that the form data is processed correctly. 

if(isset($_POST['radio_button'])){
    $selected_option = $_POST['radio_button'];
    // Process the selected radio button option here
} else {
    // Handle case where radio button is not selected
}

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