<?php
error_reporting(-1);
mb_internal_encoding('utf-8');

class StudentViever
{
	private $db;
	
	public function __construct(PDO $db){
		$this->db = $db;
	}
	public function returnResult($array){
		$request = $this->db->prepare("SELECT firstName, lastName, sex, section, exams, year FROM students LIMIT ?, ?;");
		$request->execute($array);
		$result = $request->fetchAll();
		return $result;
	}
}
$SAT = new PDO('mysql:host=localhost;dbname=sat', 'root', '');
$SAT->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$test = new StudentViever($SAT);
$array = array(3,5);
print_r($test->returnResult($array));