What are common pitfalls when dealing with radio buttons in PHP forms?

Common pitfalls when dealing with radio buttons in PHP forms include not assigning a value to each radio button, not checking if a radio button is selected before processing the form, and not properly handling the form data in the PHP script. To solve these issues, make sure each radio button has a unique value attribute, use isset() or !empty() to check if a radio button is selected, and access the selected radio button value using $_POST in the PHP script. 

<form method="post">
  <input type="radio" name="color" value="red"> Red
  <input type="radio" name="color" value="blue"> Blue
  <input type="radio" name="color" value="green"> Green
  <input type="submit" name="submit" value="Submit">
</form>

<?php
if(isset($_POST['submit'])){
  if(isset($_POST['color'])){
    $selected_color = $_POST['color'];
    echo "You selected: " . $selected_color;
  } else {
    echo "Please select a color";
  }
}
?>

Keywords

radio buttons PHP forms validation isset() empty()

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