Shell string segmentation

shell String replacement problem

#!/bin/bash
 
string="hello,shell,split,test"  
# Yes IFS Variable Replace it

OLD_IFS="$IFS"  # Save the current shell The default separator , I'll recover later
IFS=","                  # take shell The division symbol of is changed to ,“”
array=($string)     # The divider is “,”,"hello,shell,split,test" Assign a value to array It becomes an array assignment
IFS="$OLD_IFS"  # recovery shell Default delimiter configuration
 
for var in ${array[@]}
do
   echo $var
done