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<?php function mergeAttachments($a, $b) { // If both #attached arrays contain drupalSettings, then merge them // correctly; adding the same settings multiple times needs to behave // idempotently. if (!empty($a['drupalSettings']) && !empty($b['drupalSettings'])) { $drupalSettings = mergeDeepArray(array($a['drupalSettings'], $b['drupalSettings']), TRUE); // No need for re-merging them. unset($a['drupalSettings']); unset($b['drupalSettings']); } // Apply the normal merge. $a = array_merge($a, $b); if (isset($drupalSettings)) { // Save the custom merge for the drupalSettings. $a['drupalSettings'] = $drupalSettings; } return $a; } function mergeDeepArray($arrays, $preserve_integer_keys = FALSE) { $result = array(); foreach ($arrays as $array) { foreach ($array as $key => $value) { // Renumber integer keys as array_merge_recursive() does unless // $preserve_integer_keys is set to TRUE. Note that PHP automatically // converts array keys that are integer strings (e.g., '1') to integers. if (is_integer($key) && !$preserve_integer_keys) { $result[] = $value; } // Recurse when both values are arrays. elseif (isset($result[$key]) && is_array($result[$key]) && is_array($value)) { $result[$key] = mergeDeepArray(array($result[$key], $value), $preserve_integer_keys); } // Otherwise, use the latter value, overriding any previous value. else { $result[$key] = $value; } } } return $result; } function mergeDeep() { return mergeDeepArray(func_get_args()); } for($i = 0; $i <= 100000; $i++) { $a['#attached'] = array( 'library' => array( 'core/drupal', 'core/drupalSettings', ), 'drupalSettings' => [ 'bar' => ['a', 'b', 'c'], ], 'js' => array( 'baz.js' => array(), ), ); $b['#attached'] = array( 'library' => array( 'core/jquery', ), 'js' => array( 'foo.js' => array(), 'bar.js' => array(), ), 'drupalSettings' => [ 'foo' => ['d'], ], ); mergeAttachments($a['#attached'], $b['#attached']); }

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