array_slice в многомерном массиве?

У меня есть массив в php, например:

Array
(
    [0] => Array
        (
              [915] => 1
              [1295] => 1
              [1090] => 1
              [1315] => 0.93759357774
              [128] => 0.93759357774
              [88] => 0.731522789561
              [1297] => 0.731522789561
              [1269] => 0.525492880722
              [1298] => 0.525492880722
              [121] => 0.519133966069
         )
   [1] => Array
       (
              [585] => 1
              [1145] => 1
              [1209] => 1
              [375] => 1
              [1144] => 1
              [913] => 1
              [1130] => 0.996351158355
              [215] => 0.937096401456
              [1296] => 0.879373313559
              [30] => 0.866473953643
              [780] => 0.866473953643
              [1305] => 0.866473953643
              [1293] => 0.866473953643
       )

) 

Как мне получить 1–5-ю строки подмассивов для каждого массива, например:

Результат:

Array
(
    [0] => Array
        (
              [915] => 1
              [1295] => 1
              [1090] => 1
              [1315] => 0.93759357774
              [128] => 0.93759357774
         )
   [1] => Array
       (
              [585] => 1
              [1145] => 1
              [1209] => 1
              [375] => 1
              [1144] => 1
       )

)