分页

page.php

<?php    
//获取分页
public static function getOffsetLimit($page = 1, $perpage = 50) {
    if (empty($perpage)) {
        $perpage = 50;
    }
    $page = max(1, $page);
    $page = min(1000000, $page);
    $perpage = max($perpage, 1);
    $perpage = min(10000, $perpage);

    $offset = $perpage * ($page - 1);
    $limit = $perpage;
    return [$offset, $limit];
}