paging

<?php

class paging {
    private $lim;
    private $now;
    public function __construct()
    {
        $this->lim = 5;
        $this->now = 0;
    }
    public function main($num,$url)
    {
        $jumlahpagging = ceil($num/$this->lim);
        $re  = "<ul>";
        $prev_dis = ($this->now - 1 <= 0) ? "disabled" : '';
        $next_dis = ($this->now + 1 > $jumlahpagging) ? "disabled" : '';
        $link_prev = ($this->now - 1 <= 0) ? $url.($this->now - 1) : '#';
        $link_next = ($this->now + 1 <= 0) ? $url.($this->now - 1) : '#';
        $re .= "<li class='$prev_dis'><a href='". $url.($this->now - 1) ."' disabled='$prev_dis'>Sebelumnya</a></li>";
        $re .= "<li class='$next_dis'><a href='". $url.($this->now + 1) ."' $next_dis>Selanjutnya</a></li>";
        $re .= "</ul>";
        return $re;
    }

    public function position($now,$lim)
    {
        $this->lim = $lim;
        $this->now = ($now < 1) ? 0 : $now;
        return ($this->now - 1) * $lim;
    }
}
$paging = new paging();
if(isset($_GET['p'])){
$paging->position(intval($_GET['p']),10);
echo "<div class='pagination'>".$paging->main(50,'?p=',intval($_GET['p']))."</div>";
}