PHP-de OOP miras alanda guruplaýjy

Miras alanda, atanyň guruplaýjysynyň üstüni özgerdip bolýar. Mysal üçin seredeliň. Aşakdaky ýaly ata klasymyz bolsun:

<?php
	class User {
		private $name;
		private $surn;
		
		public function __construct($name, $surn) {
			$this->name = $name;
			$this->surn = $surn;
		}
		
		public function getName() {
			return $this->name;
		}
		public function getSurn() {
			return $this->surn;
		}
	}
?>

Ata klasdan aşakdaky klas miras alsyn:

<?php
	class Student extends User {
		
	}
?>

Farz edeliň, miras alyjy klasda guruplaýjyny giňeltmek isleýäris, ona goşmaça parametrler goşup:

<?php
	class Student extends User {
		private $year;
		
		public function __construct($name, $surn, $year) {
			
		}
	}
?>

Bu ýagdaýda, ilkinji setir hökmünde ata guruplaýjyny parent::__construct() arkaly çagyrmaly:

<?php
	class Student extends User {
		private $year;
		
		public function __construct($name, $surn, $year) {
			parent::__construct($name, $surn);
		}
	}
?>

parent::__construct() buýrugy esasan atanyň guruplaýjysydyr. Şonuň üçin ony talap edilýän parametrler bilen üpjün edeliň:

<?php
	class Student extends User {
		private $year;
		
		public function __construct($name, $surn, $year) {
			parent::__construct($name, $surn);
		}
	}
?>

Indi miras alyjyda okuw ýyllygyny miras alyjynyň öz aýratynlygyna ýazalyň:

<?php
	class Student extends User {
		private $year;
		
		public function __construct($name, $surn, $year) {
			parent::__construct($name, $surn);
			$this->year = $year;
		}
	}
?>

Okuw ýyly üçin getter döredeliň:

<?php
	class Student extends User {
		private $year;
		
		public function __construct($name, $surn, $year) {
			parent::__construct($name, $surn);
			$this->year = $year;
		}
		
		public function getYear() {
			return $this->year;
		}
	}
?>

Employee klasy bu sapagyň User klasyndan miras alsyn.

Employee klasynda ata guruplaýjynyň üstüni özgerdiriň, ona ýaş we maaş parametrlerini goşuň.

Ýaş we maaş üçin getterler düzüň.