In PHP, $var is used to store the value of the variable like Integer, String, boolean, character. $var is a variable and $$var stores the value of the variable inside it.
$var:
Syntax:
$variable = value;
- The $variable is the variable name
- The value is the initial value of the variable.
Example 1: This example stores and displays values with $.
PHP
<?php          // String value        $value1 = "hello Geeks";         // Display string value     echo $value1;     echo "<br/>";       // Boolean value     $value2 = true;                 // Display boolean value     echo $value2;      echo "<br/>";       // Integer value     $value3 = 34;          // Display integer value     echo $value3;     echo "<br/>"; ?> |
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Output
hello Geeks<br/>1<br/>34<br/>
$$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.
