Zbekiston respublikasi transport vazirligi toshkent davlat transport universiteti

Vorislik.
Tasavvur qiling, sizda user klassi bor. Bu sizga ba'zi maqsadlar uchun kerak va umuman olganda, biz to'liq qoniqdik - bu klass hech qanday yaxshilanishga muhtoj emas.
Mana o'sha klass:
class User
{
private $name;
private $age;


public function getName()
{
return $this->age;
}
public function setName($name)
{
$this->name = $name;
}


public function getAge()
{
return $this->age;
}


public function setAge($age)
{
$this->age = $age;
}


}
?>
Va endi bizda Ishchi klassi (ishchi) kerak bo'lgan vaziyatni tasavvur qiling. Xodim userga juda o'xshash, bir xil xususiyat va usullarga ega, lekin o'ziga xos - $ ish haqi (ish haqi) mulkini, shuningdek, ushbu mulk uchun oluvchilar va sozlashchilarni qo'shadi.
Bu holatda nima qilish kerak? User klassining kodini nusxalash va uni Worker-ga joylashtirish ahmoqlik - biz kodni takrorlashni yoqtirmaymiz.
Ishchi klassini User klassidan voris qilib olgan ma’qul bo‘lardi – bu holda ishchi ota-klassning barcha xossalari va usullariga ega bo‘ladi (maxsusdan tashqari!) Va u ularga o‘zinikini osongina qo‘shishi mumkin.
Voris kengaytma kalit so'zi yordamida amalga oshiriladi, masalan: Class Worker extensions User.
Ishchilar klassining amalga oshirilishi quyidagicha:
class Worker extends User
{
private $salary;


public function getSalary()
{
return $this->salary;
}


public function setSalary($salary)
{
$this->salary = $salary;
}
}
$worker = new Worker();
$worker->setSalary(1000);
$worker->setName('Коля'); //метод родителя
$worker->setAge(25); //метод родителя


echo $worker->getSalary();
echo $worker->getName(); //метод родителя
echo $worker->getAge(); //метод родителя
?>
Aytaylik, xodimdan tashqari bizga talaba talaba ham kerak - biz uni userdan voris qilib olamiz:
class Student extends User
{
private $course; //курс


public function getCourse()
{
return $this->course;
}


public function setCourse($course)
{
$this->course = $course;
}
}
$student = new Student();
$student->setName('Коля');
$student->setAge(25);
$student->setCourse(3);


echo $student->getName();
echo $student->getAge();
echo $student->getCourse();
?>