How can the value of a radio button be updated in a PHP form?

To update the value of a radio button in a PHP form, you can use JavaScript to dynamically change the value based on user input. You can add an event listener to the radio button to detect changes and update the value accordingly. This allows for real-time updates without needing to refresh the page. 

<form action="submit.php" method="post">
  <input type="radio" name="color" value="red" id="red"> Red
  <input type="radio" name="color" value="blue" id="blue"> Blue
</form>

<script>
  document.getElementById('red').addEventListener('change', function() {
    document.getElementById('red').value = 'red';
  });

  document.getElementById('blue').addEventListener('change', function() {
    document.getElementById('blue').value = 'blue';
  });
</script>

Keywords

PHP radio button form value update

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