如何使用覆盖方法在PHP中显示setter内容？

Question

this is my code:

<?php
    class person {
                var $name;      
                function __construct($persons_name) {
                        $this->name = $persons_name;
                }

                public function get_name() {
                        return $this->name;
                }
                protected function set_name($new_name) {
                    if ($this->name !=  "Jimmy Two Guns") {
                        $this->name = strtoupper($new_name);
                    }
                }
    }
    class employee extends person {
        protected function set_name($new_name) {
                if ($new_name ==  "Stefan TRALA") {
                    $this->name = $new_name;
                }

                else if ($new_name ==  "Johnny Fingers") {
                    person::set_name($new_name);
                }        
        }

        function __construct($employee_name) {
                $this->set_name($employee_name);
        }
    }

    $empl = new employee;
    echo $empl->set_name("Stefan TRALA");
?>

Im getting this warning: Warning: Missing argument 1 for employee::__construct() WHY ? why my echo does not work ? What did I write wrong ? Thank you!

Answer 1

Your constructor takes one argument, so it should be:

$empl = new employee("Stefan TRALA");

Then you can remove echo $empl->set_name() since it is already called in the constructor.

---

how to get the name?

add this function:

function get_name(){
  return $this->name;
}

then use it:

echo $empl->get_name();