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<?php function mergeAttachments(array $a, array $b) { // If both #attached arrays contain drupalSettings, then merge them // correctly; adding the same settings multiple times needs to behave // idempotently. if (!empty($b['drupalSettings'])) { $temp = mergeDeepArray([$a['drupalSettings'], $b['drupalSettings']], TRUE); } $a = mergeDeepArray([$a, $b]); if (isset($temp)) { $a['drupalSettings'] = $temp; } return $a; } function mergeAttachmentsOld(array $a, array $b) { if (!empty($a['drupalSettings']) && !empty($b['drupalSettings'])) { $a['drupalSettings'] = mergeDeepArray([$a['drupalSettings'], $b['drupalSettings']], TRUE); unset($b['drupalSettings']); } return mergeDeep($a, $b); } function mergeDeepArray(array $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 <= 1000; $i++) { $a['#attached'] = array( 'library' => array( 'core/drupal', 'core/drupalSettings', ), ); $b['#attached'] = array( 'library' => array( 'core/jquery', ), ); mergeAttachments($a['#attached'], $b['#attached']); }