How to get a variable name as a string in PHP?

To get a variable name as a string in PHP, the code is as follows−

Example

<?php
   $a = "This is it!";
   $$a = "Demo string!";
   print($a);
?>

Output

This will produce the following output−

This is it!

Example

Let us now see another example −

<?php
   $val = "This is it!";
   function display($var) {
      foreach($GLOBALS as $demo => $value) {
         if ($value === $var) {
            return $demo;
         }
      }
      return false;
   }
   print display($val);
?>

Output

This will produce the following output−

Val