src/Peach/Util/HashMap.php
public function keys()
    {
        $result = array();
        foreach ($this->table as $entries) {
            foreach ($entries as $entry) {
                $result[] = $entry->getKey();
            }
        }
        return $result;
    }
public function keys()
    {
        $result = array();
        foreach ($this->table as $entries) {
            foreach ($entries as $entry) {
                $result[] = $entry->getKey();
            }
        }
        return $result;
    }
この HashMap に含まれるキーの一覧を返します.
@return array この HashMap に含まれるキーの配列