Explain the difference between $message and $$message.

Answer»

The main difference between the $MESSAGE and $$message is given below:

$message	$$message
$message is a regular variable.	$$message is a reference variable.
It has a FIXED name and stores a fixed value.	It stores DATA about the variable.
Data stored in $message is fixed.	The value of the $$message can CHANGE DYNAMICALLY as the value of the variable changes.

Discussion