Small experiment using anonymous functions in arrays

php-anonymous-function-in-arrays.php

<?php

$form = [
    'action' => 'http://nextbike.com',
    'target' => '_blank',
    'method' => 'POST',
    'fields' => [
        ['type' => 'text', 'name' => 'first_name', 'label' => 'First Name'],
        ['type' => 'text', 'name' => 'last_name', 'label' => 'Last Name'],
        ['type' => 'date', 'name' => 'birthday', 'label' => 'Birthday'],
        ['type' => 'submit', 'name' => 'submit', 'label' => 'Sign Up!'],
    ]
];

$html = [
  'open' => function($form) {
      return '<form action="'.$form['action'].'" method="'.$form['method'].'" target="'.$form['target'].'">' . PHP_EOL;
  },
  'fields' => function($fields) {
      $htmlFields = '';
      foreach($fields as $field) {
          $htmlFields .= '<p>' . PHP_EOL;
          if($field['type'] !== 'submit') {
            $htmlFields .= '<label for="'.$field['name'].'">'.$field['label'].'</label>' . PHP_EOL;
            $htmlFields .= '<input type="'.$field['type'].'" name="'.$field['name'].'" id="'.$field['name'].'" />' . PHP_EOL;
          } else {
            $htmlFields .= '<input type="'.$field['type'].'" value="'.$field['label'].'" name="'.$field['name'].'" id="'.$field['name'].'" />' . PHP_EOL;
          }
          $htmlFields .= '</p>' . PHP_EOL;
      }
      return $htmlFields;
  },
  'close' => '</form>' . PHP_EOL,
];

echo $html['open']($form);
echo $html['fields']($form['fields']);
echo $html['close'];

// Outputs:
// <form action="http://nextbike.com" method="POST" target="_blank">
// <p>
// <label for="first_name">First Name</label>
// <input type="text" name="first_name" id="first_name" />
// </p>
// <p>
// <label for="last_name">Last Name</label>
// <input type="text" name="last_name" id="last_name" />
// </p>
// <p>
// <label for="birthday">Birthday</label>
// <input type="date" name="birthday" id="birthday" />
// </p>
// <p>
// <input type="submit" value="Sign Up!" name="submit" id="submit" />
// </p>
// </form>