Detailed explanation of php paging class examples

The author of this article introduces the universal PHP paging class in detail, which has certain reference value. Interested friends can refer to it. I hope it can help everyone.

<?php
/*核心:首页、上一页、下一页、尾页的url*/
/*超全局$_SERVER*/
$page = new Page(5,60);
var_dump($page->allUrl());
class Page{
//   每页显示的个数
  protected $number;
//   一共有多少数据
  protected $totalCount;
//   当前页
  protected $page;
//   url
  protected $url;
  
  public function __construct($number,$totalCount){
    $this->number= $number;
    $this->totalCount = $totalCount;
    //得到总页数
    $this->totalPage = $this->getTotalPage();
    //得到当前页数
    $this->page = $this->getPage();
    //得到URL
    $this->url = $this->getUrl();
    echo $this->url;
  }
  /*得到总页数并向上取整*/
  protected function getTotalPage(){
    return   ceil($this->totalCount/$this->number);
  }
  /**/
  protected function getPage(){
    if (empty($_GET[&#39;page&#39;])){
      $page=1;
    }elseif ($_GET[&#39;page&#39;] > $this->totalPage){
      $page = $this->totalPage;
    }elseif ($_GET["page"]<1){
      $page = 1;
    }else{
      $page = $_GET[&#39;page&#39;];
    }
    return $page;
  }
  protected function getUrl(){
    //得到协议名
    $scheme = $_SERVER[&#39;REQUEST_SCHEME&#39;];
    //得到主机名
    $host= $_SERVER[&#39;SERVER_NAME&#39;];
    //得到端口号
    $port = $_SERVER[&#39;SERVER_PORT&#39;];
    //得到路径和请求字符串
    $url = $_SERVER[&#39;REQUEST_URI&#39;];
    /*中间做处理,要将page=5等这种字符串拼接URL
    中，所以如果原来的url中有page这个参数，我们首先
    需要将原来的page参数给清空*/
    $urlArray = parse_url($url);
//     var_dump($urlArray);

    $path = $urlArray[&#39;path&#39;];
    if (!empty($urlArray[&#39;query&#39;])){
      //将query中的值转化为数组
      parse_str($urlArray[&#39;query&#39;],$array);
      //如果他有page就将它删掉
      unset($array[&#39;page&#39;]);
      //将关联数组转化为query
      $query = http_build_query($array);
      //不为空的话就与path连结
      if ($query != &#39;&#39;){
        $path = $path.&#39;?&#39;.$query;
      }
    }
    return &#39;http://&#39;. $host.&#39;:&#39;.$port.$path;
  }
  protected function setUrl($str){
    if (strstr($this->url, &#39;?&#39;)){
      $url = $this->url.&#39;&&#39;.$str;
    }else{
      $url = $this->url.&#39;?&#39;.$str;
    }
    return $url;
  }
  /*所有的url*/
  public function allUrl(){
    return [
      &#39;first&#39; => $this->first(),
      &#39;next&#39; => $this->next(),
      &#39;prev&#39;=> $this->prev(),
      &#39;end&#39;=> $this->end(),
    ];
  }
  /*首页*/
  public function first(){
    return $this->setUrl(&#39;page=1&#39;);
  }
  /*下一页*/
  public function next(){
    //根据当前page得带下一页的页码
    if ($this->page+1 > $this->totalPage) {
      $page = $this->totalPage;
    }else{
      $page = $this->page+1;
    }
    return $this->setUrl(&#39;page=&#39;.$page);
  }
  /*上一页*/
  public function prev(){
    //根据当前page得带下一页的页码
    if ($this->page - 1 < 1) {
      $page = 1;
    }else{
      $page = $this->page-1;
    }
    return $this->setUrl(&#39;page=&#39;.$page);
  }
  /*尾页*/
  public function end(){
    return $this->setUrl(&#39;page=&#39;.$this->totalPage);
  }
  /*limit 0,5*/
  public function limit(){
    $offset = ($this->page-1)*$this->number;
    return $offset.&#39;,&#39;.$this->number;
  }
  
}

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