You have think or searched that what is $ and $$, if yes then, your search end here.
$$var is known as reference variable where as $var is normal variable, in the same way program can create the variable name it can create any other string.
Let us take a example to understand:-
<?php
$var = “Sonu”;
$$var = “Monu”;
echo $var;
echo $$var;
echo $Sonu;
?>
Output:-
Sonu
Monu
Monu
Here $var variable just only print its value Sonu, $$var is a reference it uses the value of a variable whose name is the value of $var so it’s print its value Monu
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