I have this type of array what contains total income in each month:

```
Array ( [Total_Income_JAN] => 5000 [Total_Income_FEB] => 8000 [Total_Income_MAR] => 10000 )

```

How can I remove the prefix part from the array keys so that it becomes:

```
Array ( [JAN] => 4321 [FEB] => 2364 [MAR] => 2364 ) 

```