radio button in form with php code example

Example 1: radiobutton php controller example

<form action="result.php" method="post">
  Answer 1 <input type="radio" name="ans" value="ans1" /><br />
  Answer 2 <input type="radio" name="ans" value="ans2"  /><br />
  Answer 3 <input type="radio" name="ans" value="ans3"  /><br />
  Answer 4 <input type="radio" name="ans" value="ans4"  /><br />
  <input type="submit" value="submit" />
</form>
  
PHP code:

<?php 
$answer = $_POST['ans'];  
if ($answer == "ans1") {          
    echo 'Correct';      
}
else {
    echo 'Incorrect';
}        
?>

Example 2: buttons in php

class StargazerButton extends \atk4\ui\Button {

  public $model;
  public $label;

  function init() {
    parent::init();

    $this->add(new Button(['Stars', 'basic blue', 'icon'=>'star']));
    $this->label = $this->add(new Label($model['stars'], ['basic blue left pointing']));

    $this->on('click', function() {
      $this->model['stars']++;
      $this->model->save();
      return $this->reload();
    });
  }
}