oop.php

<?php 
class Book{
	
	private $title;
	private $availableCopies;
	
	public function __construct($title,$availableCopies){
		 $this->title = $title;
		 $this->availableCopies = $availableCopies;	
	}
	
	public function getTitle(){
		return $this->title;
	}
	
	public function getAvailableCopies(){	
		return $this->availableCopies;
	}
	
	public function borrowBook(){
		if($this->availableCopies > 0){
			return $this->availableCopies--;
		}	
	}
	
	public function returnBook(){	
		return $this->availableCopies++;
	}
}

class Member{
	
	private $name;
	
	public function __construct($name){
		$this->name = $name;
		
	}
	
	public function getName(){
		
		return $this->name;
	}
	
	public function borrowBook($book){
		
		$book->borrowBook();
	}
	
	public function returnBook($book){
		$book->returnBook();
	}
	
	
}

 $book1 = new Book('The Great Gatsby',5);
 $book2= new Book('To Kill a Mockingbird',3);
  
$member1 = new Member("Jone Doe");
$member2 = new Member("Jane Smith");

$member1->borrowBook($book1);
$member2->borrowBook($book2);

echo "Available Copies of '".$book1->getTitle()."':". $book1->getAvailableCopies()."\n"."</br>";
echo "Available Copies of '".$book2->getTitle()."':". $book2->getAvailableCopies()."\n";

?>