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Nội dung code:

<?php
class Book extends Db{
	public function getRand($n)
	{
		$sql="select book_id, book_name, img from book order by rand() limit 0, $n ";
		return $this->select($sql);	
	}
	
	public function getByPubliser($manhaxb)
	{
		$sql="select book_id, book_name, img from book order by rand() limit 0, $n ";
		return $this->select($sql);	
	}
	

}
?>