PHP $ variable, PHP $$ variable

PHP $ Variable:

The single dollar PHP Variables ($x, where x is the variable name) are the normal variables that temporarily stores its data to a memory location.

PHP $$ Variable:

The double dollar PHP Variables ($$x, where x is the variable name) are the reference variables that are used to store the value of the single dollar variable ($x) inside it.

Example 1: Printing values of $ Variable, $$ Variable and value of $ variable using PHP Echo Statement

<!DOCTYPE html>
<html>
<body>
 
<?php
 
$v = "xyz";  
$$v = 500;  
 
echo $v. "<br>";
echo $$v. "<br>";
echo $xyz;
 
?>
 
</body>
</html>

Example 2: Printing value of $ and $$ Variables in a single message.

<!DOCTYPE html>
<html>
<body>
 
<?php
 
$v = "xyz";  
$$v = 500;  
 
echo $v. "<br>";
echo $$v. "<br>";
echo "Value of $v is:” .$$v;
 
?>
 
</body>
</html>

Please Share