PHP inheritance constructor function didn't work - php

Question

Please check my issue i make a script but $contractempsal variable didn't work. i want employee salary but i got error. please check.
Follow is my code:-
<?php
class baseemp {
protected $firstname;
protected $lastname;
public function getfullname() {
return $this->firstname .''. $this->lastname;
}
public function __construct($first,$last) {
$this->firstname="$first";
$this->lastname="$last";
}
}
class fulltimeemp extends baseemp {
public $monthlysal;
public function monthlysalary() {
$this->monthlysal/12;
}
}
class contractemp extends baseemp {
public $hourlyrate;
public $totalhours;
public function monthlysalaryy() {
$this->hourlyrate * $this->totalhours;
}
public function __construct($hourrate,$totalhoursd){
$this->hourlyrate="$hourrate";
$this->totalhours="$totalhoursd";
}
}
$fulltimeemployee = new fulltimeemp("kannu"," singh");
$contractempsal = new contractemp("400","5");
echo $fulltimeemployee->getfullname();
echo $contractempsal->getfullname();
?>
So, this is my code. please check and tell me where i am wrong Thanks
Please check my issue i make a script but $contractempsal variable didn't work. i want employee salary but i got error. please check.

Answer 1

You need to update __construct function of constractemp class for then call parent::__construct to set first and last name.
<?php
class baseemp {
protected $firstname;
protected $lastname;
public function getfullname() {
return $this->firstname .''. $this->lastname;
}
public function __construct($first,$last) {
$this->firstname="$first";
$this->lastname="$last";
}
}
class fulltimeemp extends baseemp {
public $monthlysal;
public function monthlysalary() {
$this->monthlysal/12;
}
}
class contractemp extends baseemp {
public $hourlyrate;
public $totalhours;
public function monthlysalary() {
return $this->hourlyrate * $this->totalhours;
}
public function __construct($first,$last, $hourrate, $totalhoursd){
parent::__construct($first,$last);
$this->hourlyrate="$hourrate";
$this->totalhours="$totalhoursd";
}
}
$fulltimeemployee = new fulltimeemp("kannu"," singh");
$contractempsal = new contractemp("kannu"," singh", "400","5");
echo $fulltimeemployee->getfullname(); // display kannu singh
echo $contractempsal->getfullname(); // display kannu singh
echo $contractempsal->monthlysalary(); // display 2000