Brief analysis of PHP paging principle, simple example of PHP paging code

$pages = range(1, 100); 记录数
$page_list['end'] = (count($pages) / 10) ? ceil((count($pages) / 10)) : 0;  //总页数 最后页数
$step = isset($_GET['step']) ? $_GET['step'] : 5;    //步长
$curr_page = isset($_GET['curr_page']) ? $_GET['curr_page'] : 1; //当前页
$page_list['first'] = 1;  //首页
$page_list['prev'] = max($curr_page - 1, 1);      //上一页
$page_list['now'] = min($curr_page, $page_list['end']);  当前页
$page_list['next'] = min($curr_page + 1, $page_list['end']); //下一页
$page_list['step_first'] = max(1, $page_list['now']-$step);
$page_list['step_end'] = min($page_list['step_first']+$step, $page_list['end']);
$page_list['step_list'] = range($page_list['step_first'], $page_list['step_end']);
echo '第一页', '上一页';
foreach ($page_list['step_list'] as $value) {
    echo '' . $value . '';
}
echo'下一页', '最后页