PHP da OOP da Himoyalangan Usullar

PHP himoyalangan usullarni protected modifikatori yordamida qo‘llab-quvvatlaydi. Bunday usullar meros qilib olinadi, lekin class tashqarisida ko‘rinmaydi.

Keling, buning qanday ishlashini ko‘ramiz. Ota-classni himoyalangan usul bilan yozamiz:

<?php
	class User {
		public function setName($name) {
			$this->name = $name;
		}
		public function getName() {
			return $this->capeFirst($this->name);
		}
		
		protected function capeFirst($str) {
			return ucfirst($str);
		}
	}
?>

Keling, ushbu himoyalangan usuldan bola-classda foydalanamiz:

<?php
	class Student extends User {
		public function setSurn($surn) {
			$this->surn = $surn;
		}
		public function getSurn() {
			return $this->capeFirst($this->surn);
		}
	}
?>

Quyidagi kodda yordamchi usulni himoyalangan qiling:

<?php
	class User {
		public function setName($name) {
			if ($this->notEmpty($name)) {
				$this->name = $name;
			}
		}
		public function getName() {
			return $this->name;
		}
		
		public function notEmpty($str) {
			return strlen($str) > 0;
		}
	}
	class Employee extends User {
		public function setSurn($surn) {
			if ($this->notEmpty($surn)) {
				$this->surn = $surn;
			}
		}
		public function getSurn() {
			return $this->surn;
		}
	}
?>