Before sort:
Array
(
[a] => 13
[b] => 21
[c] => 32
[d] => 9
[e] => 13
[f] => 10
[g] => 0
[h] => 1
[i] => 16
[j] => 6
[k] => 20
[l] => 0
[m] => 0
[n] => 1
[o] => 2
[p] => 20
[q] => 4
[r] => 12
[s] => 1
[t] => 0
[u] => 6
[v] => 4
[w] => 0
[x] => 2
[y] => 1
[z] => 4
)
Array
(
[l] => 0
[t] => 0
[w] => 0
[g] => 0
[m] => 0
[y] => 1
[s] => 1
[n] => 1
[h] => 1
[x] => 2
[o] => 2
[v] => 4
[z] => 4
[q] => 4
[u] => 6
[j] => 6
[d] => 9
[f] => 10
[r] => 12
[e] => 13
[a] => 13
[i] => 16
[p] => 20
[k] => 20
[b] => 21
[c] => 32
)
Array
(
[0] => a
[a] => 0
[1] => b
[b] => 1
[2] => c
[c] => 2
[3] => d
[d] => 3
[4] => e
[e] => 4
[5] => f
[f] => 5
[6] => g
[g] => 6
[7] => h
[h] => 7
[8] => i
[i] => 8
[9] => j
[j] => 9
[10] => k
[k] => 10
[11] => l
[l] => 11
[12] => m
[m] => 12
[13] => n
[n] => 13
[14] => o
[o] => 14
[15] => p
[p] => 15
[16] => q
[q] => 16
[17] => r
[r] => 17
[18] => s
[s] => 18
[19] => t
[t] => 19
[20] => u
[u] => 20
[21] => v
[v] => 21
[22] => w
[w] => 22
[23] => x
[x] => 23
[24] => y
[y] => 24
[25] => z
[z] => 25
)
25