Magento 2 Documentation  2.3
Documentation for Magento 2 CMS v2.3 (December 2018)
Freemethod.php
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1 <?php
7 
14 {
18  public function toOptionArray()
19  {
20  $arr = parent::toOptionArray();
21  array_unshift($arr, ['value' => '', 'label' => __('None')]);
22  return $arr;
23  }
24 }
__()
Definition: __.php:13