Answer 1

In PHP, variable variables means to assign a variable to a new particular variable.
For Eg: $name='Prarabdh';
$name='Chaturvedi'; //also written as
${$name}
It takes value of a variable name as "Prarabdh" as the name of second variable. i.e. $Prarabdh='Chaturvedi';

//$name is equivalent to $Prarabdh.