Difference between $var and $$var in PHP
In PHP, $var is used to store the value of the variable like Integer, String, boolean, character. $var is a variable and $$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.
