后端开发 \ PHP \ PHP面向对象之分页类

PHP面向对象之分页类

总点击144
简介:<?php classPage { protected$num;//每页显示条数 protected$total;//总记录数 protected$pageCount;//总页数

<?php

class Page

{

protected $num;//每页显示条数

protected $total;//总记录数

protected $pageCount;//总页数

protected $current;//当前页码

protected $offset;//偏移量

protected $limit;//分页页码

/**

* 构造方法

* @param int $total 总记录数

* @param int $num 每页显示条数

*/

public function __construct($total,$num=5)

{

//1.每页显示条数

$this->num = $num;

//2.总记录数

$this->total = $total;

//3.总页数

$this->pageCount = ceil($total/$num);

//4.偏移量

$this->offset = ($this->current-1)*$num;

//5.分页页码

$this->limit = "{$this->offset},{$this->num}";

//6.初始化当前页

$this->current();

}

/**

* 初始化当前页

*/

public function current(){

$this->current = isset($_GET['page'])?$_GET['page']:'1';

//判断当前页最大范围

if ($this->current>$this->pageCount){

$this->current = $this->pageCount;

}

//判断当前页最小范围

if ($this->current<1){

$this->current = 1;

}

}

/**

* 访问没权限访问的属性

* @param string $key 想访问的属性

* @return float|int|string 返回对应要改变的条件

*/

public function __get($key){

if ($key == "limit") {

return $this->limit;

}

if ($key == "offset") {

return $this->offset;

}

if ($key == "current") {

return $this->current;

}

}

/**

* 处理分页按钮

* @return string 拼接好的分页按钮

*/

public function show(){

//判断初始页码

$_GET['page'] = isset($_GET['page'])?$_GET['page']:'1';

//将$_GET值赋给上下变量

$first = $end = $prev = $next = $_GET;

// var_dump($prev);

//上一页

//判断上一页范围

if ($this->current-1<1){

$prev['page'] = 1;

}else{

$prev['page'] = $this->current-1;

}

//下一页

//判断下一页范围

if ($this->current+1>$this->pageCount) {

$next["page"] = $this->pageCount;

}else{

$next['page'] = $this->current+1;

}

/*

首页

$first['page'] = 1;

//尾页

$end['page'] = $this->pageCount;

*/

//拼接路径

$url = "http://".$_SERVER["SERVER_NAME"].$_SERVER["SCRIPT_NAME"];

//拼接数组url地址栏后缀?传入参数

//http://xxx/xxx/Page.class.php?page=值

$prev = http_build_query($prev);

$next = http_build_query($next);

// $first = http_build_query($first);

// $end = http_build_query($end);

//拼接完整路径

$prevpath = $url."?".$prev;

$nextpath = $url."?".$next;

// $firstpath = $url."?".$first;

// $endpath = $url."?".$end;

$str = "共有{$this->total}条记录 共有{$this->pageCount}页 ";

$str .= "<a href='{$url}?page=1'>首页</a> ";

$str .= "<a href='{$prevpath}'>上一页</a> ";

$str .= "<a href='{$nextpath}'>下一页</a> ";

$str .= "<a href='{$url}?page={$this->pageCount}'>尾页</a> ";

return $str;

}

}

//自行调试

$a = new Page(10);

echo $a->show();

?>

意见反馈 常见问题 官方微信 返回顶部