class Page
{
public $limit; //存储limit条件
public $allPage; //存储总页数
public $current; //存储当前页
public $total; //存储总条数
public function __construct($total, $num = 5)
{
//计算总页数
$this->allPage = ceil($total/$num);
//处理当前页
$this->current();
//3,3 6,3
$this->limit = (($this->current-1)*$num).','.$num;
$this->total = $total;
}
protected function current()
{
$p = isset($_GET['p']) ? $_GET['p'] : 1;
// $p = max(1, $p); //最小不能小于1
// $p = min($p, $this->allPage);//最大不能超过总页数
if ($p < 1) $p = 1;
if ($p > $this->allPage) $p = $this->allPage;
$this->current = (int)$p;
}
public function show()
{
$first = $end = $pre = $next = $_GET;//处理上一页$pre['p'] = $this->current - 1;
$preStr = http_build_query($pre);
//处理下一页$next['p'] = $this->current + 1;$nextStr = http_build_query($next);
//处理首页$first['p'] = 1;
$firstStr = http_build_query($first);
//处理尾页$end['p'] = $this->allPage;
$endStr = http_build_query($end);
$str = "共{$this->total}条数据 第{$this->current}/{$this->allPage}页 | ";
$str .= "首页| ";$str .= "上一页| ";$str .= "下一页| ";$str .= "尾页";
return $str;
}
}
