Programmatically create a text format

<php>
$format_exists = (bool) db_query_range('SELECT 1 FROM {filter_format} WHERE name = :name', 0, 1, array(':name' => 'My Filter'))->fetchField();

if (!$format_exists) {
  // Define allowed tags.
  $allowed_tags = [
    'grouping' => '<p> <hr> <pre> <blockquote> <ol> <ul> <li> <dl> <dt> <dd> <figure> <figcaption> <div> <main>',
    'others' => '<source>',
  ];

  $format = [
    'format' => 'my_filter',
    'name' => 'My Filter',
    // Use a higher weight here to ensure that this format will not
    // be the default format for anyone.
    'weight' => 15,
    'filters' => [
      // Allowed HTML tags.
      'filter_html' => [
        'status' => 1,
        'weight' => 4,
        'settings' => [
          'allowed_html' => implode(' ', $allowed_tags),
          'filter_html_help' => 0,
          'filter_html_nofollow' => 0,
        ],
      ],
    ],
  ];

  // Prepare and save the text format.
  $format = (object) $format;
  filter_format_save($format);
  drupal_set_message(t('A <a href="@filter">My Filter</a> text format has been created.', array('@filter' => url('admin/config/content/formats/' . $format->format))));
}