Answer / prasad

$message is variable and $$message is variable variable.
$message="hello";
$$message="world";
echo $hello; // prints world
echo ${$message} //prints world

variable variable cant be used in php superglobalarray. and
cant use in functions and within classes

Answer / sakthivel

$var1 = "hello world";
$var2 = $var1;
$$var2 = "hello world";

Answer / vikram

$message="hello";
$hello="world";
echo $$message;
// will print "world"..this concept is called "variable of
variables"...

Answer / mohit

$message is a variable and $$message is a refrence variable
that have the refrence of $message.

Answer / laxmikanta pradhan

$message is variable and $$message is variable variable i.e.
$message is a variable whereas $$message is a refrence
variable having the refrence of $message.
Ex. $message="hello";
$$message="world";
echo $hello; // prints world
echo ${$message} //prints world

Answer / abhilash

if $message1 = "hello";
and $message = "message1";
den $$message = hello

Answer / keshab

$test = "example";
$temp = "test";

echo $temp // output is "test";
echo $$temp// output is "example";

thanks

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