14     /** @var string[] the currently set values */
15     protected $values = [];  variable in dokuwiki\\plugin\\data\\Form\\DropdownElement
48                 return $this->values;
50                 return $this->values[0];
55         $this->values = $this->setValuesInOptGroups((array)$value);
56         if (!$this->values) {
58             $this->values = $this->setValuesInOptGroups((array)$this->getFirstOptionKey());
102      * @param string[] $values The values to be set
103      * @return string[] The values actually set
105     protected function setValuesInOptGroups($values)  argument
111             $found = $optGroup->storeValues($values);
112             $values = array_diff($values, $found);
126             // use array notation when multiple values are allowed