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Difference between PHP and C#
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Difference between $var and $$var in PHP

Last Updated : 18 Oct, 2021
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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.


Next Article
Difference between PHP and C#
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sravankumar_171fa07058
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Article Tags :
  • Difference Between
  • Web Technologies
  • PHP
  • PHP-basics
  • PHP-Questions
  • Web Technologies - Difference Between

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