public static function AttributeHelper::mergeCollections in Drupal 8

Same name and namespace in other branches

1. 9 core/lib/Drupal/Core/Template/AttributeHelper.php \Drupal\Core\Template\AttributeHelper::mergeCollections()

Merges two attribute collections.

Parameters

\Drupal\Core\Template\Attribute|array $a: First Attribute object or array to merge. The returned value type will be the same as the type of this argument.

\Drupal\Core\Template\Attribute|array $b: Second Attribute object or array to merge.

Return value

\Drupal\Core\Template\Attribute|array The merged attributes, as an Attribute object or an array.

Throws

\InvalidArgumentException If at least one collection argument is neither an Attribute object nor an array.

4 calls to AttributeHelper::mergeCollections()

AttributeHelperTest::testMergeCollections in core/tests/Drupal/Tests/Core/Template/AttributeHelperTest.php

@covers ::mergeCollections @dataProvider providerTestMergeCollections

AttributeHelperTest::testMergeCollectionsArgumentException in core/tests/Drupal/Tests/Core/Template/AttributeHelperTest.php

@covers ::mergeCollections

template_preprocess in core/includes/theme.inc

Adds a default set of helper variables for preprocessors and templates.

template_preprocess_field in core/includes/theme.inc

Prepares variables for field templates.

File

core/lib/Drupal/Core/Template/AttributeHelper.php, line 60

Class

AttributeHelper

Helper class to deal with mixed array and Attribute operations.

Namespace

Drupal\Core\Template

Code

public static function mergeCollections($a, $b) {
  if (!($a instanceof Attribute || is_array($a)) || !($b instanceof Attribute || is_array($b))) {
    throw new \InvalidArgumentException('Invalid collection argument');
  }

  // If both collections are arrays, just merge them.
  if (is_array($a) && is_array($b)) {
    return NestedArray::mergeDeep($a, $b);
  }

  // If at least one collections is an Attribute object, merge through
  // Attribute::merge.
  $merge_a = $a instanceof Attribute ? $a : new Attribute($a);
  $merge_b = $b instanceof Attribute ? $b : new Attribute($b);
  $merge_a
    ->merge($merge_b);
  return $a instanceof Attribute ? $merge_a : $merge_a
    ->toArray();
}