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PHP $ and $$ Variables

In this tutorial, we will learn about the difference between the $variable and $$variable.

$Variable:

The $var (single dollar variable) is a simple variable with the name var that stores any value like string, integer, float, etc.

Example:

<?php
$a=10;
$b="Welcome";
echo $a ."\n";
echo $b;
?>
Try it
In the above example, $a and $b both are simple variables where $a is an integer variable and $b is a string variable you can easily access the value of this variable.

$$Variable:

The $$var_name is known as a reference variable where $var_name is a normal variable. The $$var_name used to refer to the variable with the name as the value of the variable $var_name.

Example:

<?php
$fruit = "apple";
$apple="sweet";
echo $fruit."\n";
echo $$fruit."\n";
echo $apple."\n";
?>
Try it
In the above example, $$fruit is a reference of $fruit, where $fruit is a simple variable that can hold anything like integer, string, float, etc. But $$fruit is a reference variable that stores the variable $fruit.

Example:

<?php
$fruit = "apple";
${$fruit}="sweet";
echo $fruit."\n";
echo $$fruit."\n";
echo $apple;
?>
Try it
In this case, $fruit is a variable that stores the value “apple” and $apple is another variable that holds the value “sweet”. When the program executes $fruit replace with the $apple. If you print the $fruit then the value will be “apple” and when you print $$fruit that means $apple ($fruit is replaced by the apple) and the value will be “sweet”.

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