The $ operator in PHP is used to declare a variable. In PHP, a variable starts with the $ sign followed by the name of the variable. For example, below is a string variable:
$var_name = "Hello World!";
The $var_name is a normal variable used to store a value. It can store any value like integer, float, char, string etc. On the other hand, the $$var_name is known as reference variable where $var_name is a normal variable. The $$var_name used to refer to the variable with the name as value of the variable $var_name.
Input : $Hello = "Geeks for Geeks" $var = "Hello" echo $var echo $$var Output : Hello Geeks for Geeks Input : $GFG = "Welcome to GeeksforGeeks" $var = "GFG" echo $var echo $$var Output : GFG Welcome to GeeksforGeeks
Explanation: In the above example, $var stores the value “Hello”, so $$var will refer to the variable with name Hello i.e., $Hello.
Below program will illustrate the $ and $$ operator in PHP.
Hello GeeksforGeeks GFG Welcome to GeeksforGeeks
- Ternary operator vs Null coalescing operator in PHP
- 'AND' vs '&&' as operator in PHP
- Double not (!!) operator in PHP
- What is the difference between the | and || or operator in php?
- PHP 7 | Spaceship Operator
- Difference between Search Engine and Web Browser
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.