PHP 计算分页的类
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2022-04-02 19:18:03
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PHP 计算分页的类
<? class pagination { public function __construct() { } public function calculate_pages($total_rows, $rows_per_page, $page_num) { $arr = array(); // calculate last page $last_page = ceil($total_rows / $rows_per_page); // make sure we are within limits $page_num = (int) $page_num; if ($page_num < 1) { $page_num = 1; } elseif ($page_num > $last_page) { $page_num = $last_page; } $upto = ($page_num - 1) * $rows_per_page; $arr['limit'] = 'LIMIT '.$upto.',' .$rows_per_page; $arr['current'] = $page_num; if ($page_num == 1) $arr['previous'] = $page_num; else $arr['previous'] = $page_num - 1; if ($page_num == $last_page) $arr['next'] = $last_page; else $arr['next'] = $page_num 1; $arr['last'] = $last_page; $arr['info'] = 'Page ('.$page_num.' of '.$last_page.')'; $arr['pages'] = $this->get_surrounding_pages($page_num, $last_page, $arr['next']); return $arr; } private function get_surrounding_pages($page_num, $last_page, $next) { $arr = array(); $show = 5; // how many boxes // at first if ($page_num == 1) { // case of 1 page only if ($next == $page_num) return array(1); for ($i = 0; $i < $show; $i ) { if ($i == $last_page) break; array_push($arr, $i 1); } return $arr; } // at last if ($page_num == $last_page) { $start = $last_page - $show; if ($start < 1) $start = 0; for ($i = $start; $i < $last_page; $i ) { array_push($arr, $i 1); } return $arr; } // at middle $start = $page_num - $show; if ($start < 1) $start = 0; for ($i = $start; $i < $page_num; $i ) { array_push($arr, $i 1); } for ($i = ($page_num 1); $i < ($page_num $show); $i ) { if ($i == ($last_page 1)) break; array_push($arr, $i); } return $arr; } } ?>
2. [代码]使用方法
$p = new pagination(); $arr = $p->calculate_pages(70, 10, 1);
3. [代码]返回结果
Array ( [limit] => LIMIT 0,10 [current] => 1 [previous] => 1 [next] => 2 [last] => 7 [info] => Page (1 of 7) [pages] => Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 ) )
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