Pagination

pagination.php

<?php
function getPagination($page = 1, $amount = 10)
{
/*
        1 -> 10 | 0 -> 9
        2 -> 10 | 10 => 19
        3 -> 10 | 20 => 29
        4 -> 10 | 30 => 39
*/
        $page = intval($page);
        $amount = intval($amount);

        if($page==0)
                $page = 1;
        if($amount==0)
                $amount = 10;

        $start = ($page - 1) * $amount;
        $end = $page * $amount - 1;

        $result = array
        (
                'start' => $start,
                'end' => $end
        );
        return $result;
}

print_r(getPagination());
print_r(getPagination(0, 1));
print_r(getPagination(2, 20));
print_r(getPagination('a', 'b'));

/*
ourput:
Array
(
    [start] => 0
    [end] => 9
)
Array
(
    [start] => 0
    [end] => 0
)
Array
(
    [start] => 20
    [end] => 39
)
Array
(
    [start] => 0
    [end] => 9
)
*/