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What does $$ mean in PHP?

王林
王林Original
2019-08-22 10:44:084647browse

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:

What does $$ mean in PHP?

##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

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