reverse the element order in the array

Sure, you can reverse the element order in an array by using a loop to iterate through the array and swapping each element with its corresponding element at the opposite end of the array. Here's some sample code in Python:

arr = [1, 2, 3, 4, 5]
for i in range(len(arr)//2):
    temp = arr[i]
    arr[i] = arr[len(arr)-i-1]
    arr[len(arr)-i-1] = temp
print(arr)

This will output: `[5, 4, 3, 2, 1]`