yii\rbac\PhpManager::getChildren PHP Method

    public function getChildren($name)
    {
        return isset($this->children[$name]) ? $this->children[$name] : [];
    }

 /**
  * @return array
  */
 public function getChildrens()
 {
     if (!$this->_childrens) {
         $this->_childrens = $this->_authMan->getChildren($this->name);
     }
     return $this->_childrens;
 }