Difference between PHP and C#

Difference between $var and $$var in PHP

Last Updated : 18 Oct, 2021

In PHP, $var is used to store the value of the variable like Integer, String, boolean, character. $var is a variable and $$var stores the value of the variable inside it.

$var:

Syntax:

$variable = value;

The $variable is the variable name
The value is the initial value of the variable.

Example 1: This example stores and displays values with $.

PHP

<?php  
  
       // String value 
       $value1 = "hello Geeks";   
   
    // Display string value 
    echo $value1;  
    echo "<br/>"; 
  
    // Boolean value 
    $value2 = true;        
      
    // Display boolean value 
    echo $value2;   
    echo "<br/>"; 
  
    // Integer value 
    $value3 = 34;     
  
    // Display integer value 
    echo $value3;  
    echo "<br/>"; 
?>

Output

hello Geeks<br/>1<br/>34<br/>

$$var: $$var stores the value of $variable inside it.

Syntax:

$variable = "value";  
$$variable = "new_value";

$variable is the initial variable with the value.
$$variable is used to hold another value.

We can get another value by using the $value of the first variable.

Example 2: PHP program to demonstrates $$var.

PHP

<?php  
  
      // String value 
      $value1 = "hello";   
  
       // Display string value 
      echo $value1;  
  
      echo "\n"; 
  
      // Store another string in $$var 
      $$value1 = "Hello php"; 
  
    // Access another string using 
    // value of $var 
      echo "$hello"; 
?>

Output

hello
Hello php

Difference between Both: The variable $var is used to store the value of the variable and the variable $$val is used to store the reference of the variable.

Difference between PHP and C#

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