php分页类

1.需求

学会php分页类的使用

2.参考例子

CI的分页类

3.代码部分

<?php

class pagination{
    public $pagesize=20;
    public $pageindex=2;
    public $total_row=202;
    public $linkurl='test.php?c=1&m=2';
    public $pagestr="&page=";
    public $pageshownum=22;

    public function __construct($params = array())
    {
        if (0 < count($params)) {
            $this->initialize($params);
        }
    }

    public function initialize($params = array())
    {
        if (0 < count($params)) {
            foreach ($params as $key => $val ) {
                if (isset($this->$key)) {
                    $this->$key = $val;
                }
            }
        }
    }
    public function create_link()
    {
        if ($this->total_row <= 0) {
            return "";
        }

        if ($this->pagesize <= 0) {
            return "";
        }


        $maxPage=0;
        if($this->total_row%$this->pagesize === 0)
        {
            $maxPage =(int)$this->total_row/$this->pagesize;
        }
        else
        {
            $maxPage =(int)($this->total_row/$this->pagesize)+1;
        }

        if ($maxPage < $this->pageindex) {
            return "";
        }

        $num = $this->pageshownum;
        if($num>$maxPage)
        {
            $num=$maxPage;
        }

        return $this->PageSatte($maxPage, $this->pageshownum, $this->pageindex, $this->total_row, $this->linkurl, $this->pagestr);


    }


    private function PageSatte($maxpage,$pageshownum, $pageindex, $docount, $linkurl, $pagetag = "&page")
    {
        $num = $pageshownum;
        if($num>$maxpage)
        {
            $num=$maxpage;
        }
        $str='<ul class="m-pagination1 clearfix">';

        $str.='<span>第'.$pageindex."/".$docount."页</span>";
        $str.='<span>共'.$maxpage."页</span>";
        if($pageindex!==1)
        {
            $str.="<li><a href=".$linkurl.$pagetag."1".">第一页</a></li>";
            $str.="<li><a href=".$linkurl.$pagetag.($pageindex-1).">上一页</a></li>";
        }

        for($i=1;$i<($maxpage+1);$i+=$num)
        {
            if(($i<=$pageindex) && ($pageindex<($i+$num)))
            {
                for($j=$i;$j<($i+$num);$j++)
                {
                    if($pageindex!==$j)
                    {
                        $str.="<li><a href=".$linkurl.$pagetag.$j.">".$j."</a></li>";
                    }
                    else
                    {
                        $str.="<li><a>".$j."</a></li>";
                    }
                }
            }
        }

        if($pageindex<$maxpage)
        {
            $str.="<li><a href=".$linkurl.$pagetag.($pageindex+1).">下一页</a></li>";
            $str.="<li><a href=".$linkurl.$pagetag.$maxpage.">最后一页</a></li>";
        }
        return $str;
    }
}
$config=array(
    'pagesize'=>30,
    'pageindex'=>1,
    'total_row'=>303,
    "linkurl"=>'localhost/index.php?c=index&m=index',
    "pagestr"=>'$page=',
    'pageshownum'=>10
);
$obj  = new pagination($config);
echo $obj->create_link();

4.总结

主要是生成数字那部分的算法和不合理情况的返回空值的设定。