Add a html field to a form in Drupal 8 & 9

 The Form API changed a bit over the years. This is the way add a html field to a form in Drupal 8 & 9.


$form['filed_name'] = [ '#markup' => '<h2>' . $node->get('field_name')->getString() . '$</h2>', ];


$form['filed_age'] = [ '#markup' => '<h4>' . $node->get('field_age')->getString() . '$</h4>', ];

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Write a program in PHP to reverse a number

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