Mbinu Zilizolindwa katika OOP katika PHP

PHP inasaidia mbinu zilizolindwa kwa kutumia kibadilishi protected. Mbinu kama hizi hurithiwa, lakini hazionekani ngeni ya darasa.

Wacha tuone jinsi hii inavyofanya kazi. Tuandike darasa la mzazi na mbinu iliyolindwa:

<?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);
		}
	}
?>

Tutumie mbinu hii iliyolindwa katika darasa la mzao:

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

Katika msimbo unaofuata fanya mbinu ya usaidizi kuwa iliyolindwa:

<?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;
		}
	}
?>