Bash: split string into array

#!/usr/bin/env bash

# Split string into array
# SPLITTED_ARRAY is a global array to store split result
#
# Usage example:
#
#     split "1,2,3", ","
#     result=0
#     for i in ${SPLITTED_ARRAY[*]}
#     do
#         result=$(($result + $i))
#     done
#
# Will output "6"

declare -a SPLITTED_ARRAY
function split {
    local OLDIFS=$IFS

    IFS=$2
    SPLITTED_ARRAY=()
    for i in $1
    do
        SPLITTED_ARRAY+=($i)
    done
    IFS=$OLDIFS
}