public static function convertKatakanaToHiragana($str) { return mb_convert_kana($str, 'c', 'UTF-8'); }
public function testConvertKatakanaToHiraganaWhenMixCharacters() { $result = Helper::convertKatakanaToHiragana($this->mixCharacters); $this->assertEquals('今日、Joo「じょお」は学校にいます。', $result); }