Let's understand it with an example
$a="Please Test";
$xyz="a";
echo $$xyz
Output would be :
//Please Test
As $a is a simple variable with the value "Please Test" . $xyz is another variable consist of "a", which is actually a message type for $xyz but ultimately a variable declared previously.
Now $$xyz , going to check what insde the variable $xyz and as there is "a", then it will take a as the variable and print whatever("Please Test") in it.
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