Basic Question regarding PHP

[nawrioj]

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

 

[748323]

You are dealing with variables, and variable variables.

All variable names in PHP start with $.

Example:

<?

$name = 'scorpion';
echo $name; will display 'scorpion'

?>

Variable variables are just what they sound like. They are variables, with a name that's also changeable. So...

$name = "john";
$$name = "ss";

echo $john; // will display 'ss';

It might be hard to understand, but it makes perfect sense.
Take my code again:
$name = "john";
$$name = "ss";

In the second line, the first $ is to declare the variable, and its replacing "$name" with its value, which is john. Therefore, its declaring a variable named "john", and placing "ss" as its value..

They're very useful, but I don't use them that often. When you need to use them, you'll know.

 

[jpadie]

$message is a variable
$$message is a reference to a variable variable...

so

$message = "hello";
echo $message ; gives "Hello"

echo $$message; //gives nothing

$hello = "variable variable";
echo $$message; //gives "variable variable"
[/oode]