Debug print drupal 8 variables

Use Devel and kint ,
and search Kint

NOTE: Please make sure devel profile must be kint
ksm($form);  // print the form with search option in kint

1 - $form_state->getValues(); // Shows all the form field value
2 - $form_state->getUserInput(); //to get the user input including buttons clicked


+++++++++++++++++++++++
dump(_context|keys) }} // in twig file

• Compare string in Twig file 

{% set form_id = form.custom_data.form_id %}

{% if form_id == "node_story_edit_form" %} 

Yes i am here 

{% endif %}

   2 - get the # valued of form in twig templates, :
All the array and object value can get by  dot(.) operation while # value get by direct array like  below,

if($form['#form_id'] == 'node_video_form' || $form['#form_id'] == 'node_video_edit_form'){
   
   $form['#custom_data'] = array('custom_form_id' => $form['#form_id']);

   ksm($form);
}

in twig file :
{{ kint(form['#custom_data'].custom_form_id) }}

How to get the value (or use the function )within the class : 

I am printing the ksm($form['actions']['delete']['#url']->getOptions()['entity']); in form alter module,

and get the output as below , 

Motive it , how to get the values of node field like, vid,languagecode

if we got anywhere the namespace or class name , then we can call the function directly after it

here, Drupal\node\entity\Node  All the function will work like a charm,

So I am using the $node->toArray(),

   ksm($form['actions']['delete']['#url']->getOptions()['entity']->toArray());

Now i got the Array value of all the fields,

Get Current Date With Format Drupal-8:

$current_timestamp = \Drupal::time()->getCurrentTime();

  $format_date = \Drupal::service('date.formatter')->format($current_timestamp, 'custom', 'Y-m-d H:i:s', '','');