Define a setter and getter
<?php class Employee{ private $employeeid; function setEmployeeID($employeeid) { $this->employeeid = $employeeid; } function getEmployeeID() { return $this->employeeid; } } $drone1 = new Employee(); $drone1->setEmployeeID("12345"); $drone2 = clone $drone1; $drone2->setEmployeeID("67890"); echo "drone1 employeeID: ".$drone1->getEmployeeID()."<br />"; echo "drone2 employeeID: ".$drone2->getEmployeeID()."<br />"; $drone1 = new Employee(); $drone1->setEmployeeID("12345"); $drone2 = clone $drone1; $drone2->setEmployeeID("67890"); echo "employeeID: ".$drone1->getEmployeeID()."<br />"; echo "employeeID: ".$drone2->getEmployeeID()."<br />"; ?>