<?php
/**
 * Кол-во студентов
 */
const STUDENTS_COUNT = 100000;

/**
 * Шаг
 */
const STUDENTS_PART  = 1000;


if (isset($_GET['start'])) {
	$start = (int) $_GET['start'];
} else {
	$start = 1;
}


if ($start + STUDENTS_PART > STUDENTS_COUNT) {
	$finish = STUDENTS_COUNT;
} else {
	$finish = $start + STUDENTS_PART;
}

$students = [];

for ($i = $start; $i <= $finish; $i++) {
	array_push($students, [
		'number'     => $i,
		'first_name' => getRandomString(),
		'last_name'  => getRandomString()
	]);
}

print json_encode($students);

/**
 * Получить случайную строку
 */
function getRandomString() {
	return substr(md5(rand(0, 99999999999999999)), rand(0,8), rand(9, 16));
}