PHP-de OOP-da interfeýsleriň ulanylyşy boýunça amaly iş

Geliň, interfeýsleriň ulanylyşyny amalynda synap göreli. Öňki sapakdaky şekiller meselesini çözeris, ýöne indi abstrakt klasslar däl, interfeýsler ulanyp.

Şeýlelik bilen, indi bizde Figure interfeýsi berlen:

Figure.php<?php
  interface Figure
  {
    public function getSquare();
    public function getPerimeter();
  }
?>

Geliň, bu interfeýsiň usullaryny amala aşyrýan Quadrate klasyny ýazalyň:

Quadrate.php<?php
  class Quadrate implements Figure
  {
    private $a;
    
    public function __construct($a)
    {
      $this->a = $a;
    }
    
    public function getSquare()
    {
      return $this->a * $this->a;
    }
    
    public function getPerimeter()
    {
      return 4 * $this->a;
    }
  }
?>

Bu nähili işleýär: eger interfeýsde düşündirilen haýsydyr bir usuly amala aşyrmagy ýatdan çykarsak, PHP bize fatal ýalňyşlyk çykarar. Geliň, şeýle hem Rectangle klasyny amala aşyralyň:

Rectangle.php<?php
  class Rectangle implements Figure
  {
    private $a;
    private $b;
    
    public function __construct($a, $b)
    {
      $this->a = $a;
      $this->b = $b;
    }
    
    public function getSquare()
    {
      return $this->a * $this->b;
    }
    
    public function getPerimeter()
    {
      return 2 * ($this->a + $this->b);
    }
  }
?>