What is the difference between $message and $$message?

What is the difference between $message and $$message?


They are both variables. But $message is a variable with a fixed name.
$$message is a variable who‘s name is stored in $message.

 For example
 if $message contains ―var1, $$message is the same as $var.

Detailed Code :

<?php
//Dear Techies this Script has one simple variable ie
$car_name = 'Ford';
//now  assign variable $car_name to $get_car_name
$get_car_name = $car_name;
echo $get_car_name.'<br>';
//answer is : Ford;

//this is simple variable..
//we can get the same answer in different technique..this can be done by
//using reference variable or variable of variable or using $$ dollar sign
//check this

$get_car_name_using_ref_var = 'car_name';

echo $$get_car_name_using_ref_var;
?>

I think now you can understand the difference between variable and reference variable in PHP

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