PHP-de OOP-da Goragly usullary

PHP goragly usullary protected modifikatory arkaly goldaýar. Beýle usullary miras alynýar, ýöne klasyň daşyndan görünmeýär.

Geliň, bu nähli işleýändigine seredeliň. Goragly usuly bolan ata-klas ýazaýalyň:

<?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);
		}
	}
?>

Geliň, şu goragly usuldan mirasçy klasda peýdalanalyň:

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

Indiki koda ýardamçy usuly goragly ediň:

<?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;
		}
	}
?>