Operator is used to define variables in php. For example, message. Such variables can contain any type of value like int, string, etc.
$$ is a special operator that contains the name of another variable and can be used to access the value of that variable.
Following the example, shows the usage of '′vs′$' operators.
<!DOCTYPE html> <html> <head> <title>PHP Example</title> </head> <body> <?php $welcome = "message"; $message = "Welcome to Tutorialspoint"; echo $welcome; print("<br/>"); echo $$welcome; ?> </body> </html>
message Welcome to Tutorialspoint