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PHP7 Valid Return Type

<?php
   class MathOperations {
      protected $n = 10;

      // Try to get the Division by Zero error object and display as Exception
      public function doOperation(): string {
         try {
            $value = $this->n % 0;
            return $value;
         } catch (DivisionByZeroError $e) {
            return $e->getMessage();
         }
      }
   }

   $mathOperationsObj = new MathOperations();
   print($mathOperationsObj->doOperation());
?>

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