サブパターン関数の実行
Array
(
    [0] => Array
        (
            [0] => sunday
            [1] => saturday
        )

)
Array
(
    [0] => sunday
)
Array
(
    [0] => sunday
    [1] => 
    [2] => sun
)
Array
(
    [0] => sunday
    [1] => sun
)