What does $$ mean in PHP?

First, we give a piece of code:

<?php
$a = &#39;abc&#39;;
$$a = &#39;789&#39;;
echo $abc;
?>

The result is shown in the figure:

##Explanation:

$a ='abc';

$$a can be understood as parsing the following $a first, then parsing it, and finally parsing it into $abc

So directly printing $abc is a variable , it prints out as 789

For more related PHP issues, please visit the PHP Chinese website:

php video tutorial

The above is the detailed content of What does $$ mean in PHP?. For more information, please follow other related articles on the PHP Chinese website!