PHP $ and $$ Variables

The $a is a variable with the $a  name that stores the value like string, int, float, etc.

The $$aa is a reference variable that stores the value of the $variable inside it.

Examples.

<?php
$a = "xyz";  
$$b = 50;  
echo $a."
";  
echo $$b."
";  
echo $xyz;    
?>

In the above example, we have assigned a value to the variable a as xyz. The value of the reference variable $$b is assigned as 50.

Now we have printed the values $a, $$b and $xyz.

 

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