PHP Function to get First 5 Values of array

Array
(
    [university] => 57
    [iit] => 57
    [jee] => 44
    [application] => 28
    [study] => 26
    [college] => 23
    [exam] => 19
    [colleges] => 19
    [view] => 19
    [amp] => 18
)

Как получить массив с первыми 5 элементами?