PHP SPL 标准库之 Countable_php教程
这篇文章主要介绍了PHP标准库 (SPL)——Countable用法,结合实例形式分析了PHP标准库 (SPL)Countable基本功能、原理、用法及操作注意事项,需要的朋友可以参考下
本文实例讲述了CI框架简单分页类用法。分享给大家供大家参考，具体如下：
/**
*
* 关于 页码有效性的判断需要加在 控制器中判断，即当页码数<1或者>总页数
*
*/
class Custom_pagination
{
var $page_url = ''; //分页目标URL
var $page_size = 10; //每一页行数
var $page_num = 1;//页码
var $rows_num= '';//数据总行数
var $links_num= 3;//选中链接前后的链接数，必须大于等于1
var $anchor_class= '';//链接样式类
var $current_class= '';//当前页样式类
var $full_tag_open= '';//分页开始标签
var $full_tag_close= '';//分页结束标签
var $info_tag_open= '';
var $info_tag_close= ' ';
var $first_tag_open= '';
var $first_tag_close= ' ';
var $last_tag_open= ' ';
var $last_tag_close= '';
var $cur_tag_open= ' <strong>';
var $cur_tag_close= '</strong>';
var $next_tag_open= ' ';
var $next_tag_close= ' ';
var $prev_tag_open= ' ';
var $prev_tag_close= '';
var $num_tag_open= ' ';
var $num_tag_close= '';
public function __construct($params = array())
{
if (count($params) > 0)
{
$this->init($params);
}
}
function init($params = array()) //初始化数据
{
if (count($params) > 0)
{
foreach ($params as $key => $val)
{
if (isset($this->$key))
{
$this->$key = $val;
}
}
}
}
function create_links()
{
///////////////////////////////////////////////////////
//准备数据
///////////////////////////////////////////////////////
$page_url = $this->page_url;
$rows_num = $this->rows_num;
$page_size = $this->page_size;
$links_num = $this->links_num;
if ($rows_num == 0 OR $page_size == 0)
{
return '';
}
$pages = intval($rows_num/$page_size);
if ($rows_num % $page_size)
{
//有余数pages+1
$pages++;
};
$page_num = $this->page_num < 1 ? '1' : $this->page_num;
$anchor_class = '';
if($this->anchor_class !== '')
{
$anchor_class = 'class="'.$this->anchor_class.'" ';
}
$current_class = '';
if($this->current_class !== '')
{
$current_class = 'class="'.$this->current_class.'" ';
}
if($pages == 1)
{
return '';
}
if($links_num < 0)
{
return '- -！links_num必须大于等于0';
}
////////////////////////////////////////////////////////
//创建链接开始
////////////////////////////////////////////////////////
$output = $this->full_tag_open;
$output .= $this->info_tag_open.'共'.$rows_num.'条数据 第 '.$page_num.'/'.$pages.' 页'.$this->info_tag_close;
//首页
if($page_num > 1)
{
$output .= $this->first_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url).'" rel="external nofollow" >首页</a>'.$this->first_tag_close;
}
//上一页
if($page_num > 1)
{
$n = $page_num - 1;
$output .= $this->prev_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$n).'" rel="external nofollow" rel="external nofollow" >上一页</a>'.$this->prev_tag_close;
}
//pages
for($i=1;$i<=$pages;$i++)
{
$pl = $page_num - $links_num < 0 ? 0 : $page_num - $links_num;
$pr = $page_num + $links_num > $pages ? $pages : $page_num + $links_num;
//判断链接个数是否太少，举例，假设links_num = 2，则链接个数不可少于 5 个，主要是 当page_num 等于 1， 2 和 n，n-1的时候
if($pr < 2 * $links_num + 1)
{
$pr = 2 * $links_num + 1;
}
if($pl > $pages-2 * $links_num)
{
$pl = $pages - 2 * $links_num;
}
if($i == $page_num)
{ //current page
$output .= $this->cur_tag_open.'<span '.$current_class.' >'.$i.'</span>'.$this->cur_tag_close;
}else if($i >= $pl && $i <= $pr)
{
$output .= $this->num_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$i).'" rel="external nofollow" >'.$i.'</a>'.$this->num_tag_close;
}
}
//下一页
if($page_num < $pages)
{
$n = $page_num + 1;
$output .= $this->next_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$n).'" rel="external nofollow" rel="external nofollow" >下一页</a>'.$this->next_tag_close;
}
//末页
if($page_num < $pages)
{
$output .= $this->last_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$pages).'" rel="external nofollow" >末页</a>'.$this->last_tag_close;
}
$output.=$this->full_tag_close;
return $output;
}
}
控制器里调用
基于PHP实现堆排序原理_php教程
这篇文章主要介绍了基于PHP实现堆排序原理及实例详解,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
$config['page_url']
= 'about/science';
$config['page_size'] = $pagesize;
$config['rows_num'] = $num_rows;
$config['page_num'] = $page;
$this->load->library('Custom_pagination');
$this->custom_pagination->init($config);
echo $this->custom_pagination->create_links();
<?php
class page{
public $page; //当前页
public $pagenum; // 页数
public $pagesize; // 每页显示条数
public function __construct($count, $pagesize){
$this->pagenum = ceil($count/$pagesize);
$this->pagesize = $pagesize;
$this->page =(isset($_GET['p'])&&$_GET['p']>0) ? intval($_GET['p']) : 1;
}
/**
* 获得 url 后面GET传递的参数
*/
public function getUrl(){
$url = 'index.php?'.http_build_query($_GET);
$url = preg_replace('/[?,&]p=(\w)+/','',$url);
$url .= (strpos($url,"?") === false) ? '?' : '&';
return $url;
}
/**
* 获得分页HTML
*/
public function getPage(){
$url = $this->getUrl();
$start = $this->page-5;
$start=$start>0 ? $start : 1;
$end = $start+9;
$end = $end<$this->pagenum ? $end : $this->pagenum;
$pagestr = '';
if($this->page>5){
$pagestr = "<a href=".$url." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" p=1".">首页</a> ";
}
if($this->page!=1){
$pagestr.= "<a href=".$url." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" p=".($this->page-1).">上一页</a>";
}
for($i=$start;$i<=$end;$i++){
$pagestr.= "<a href=".$url." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" p=".$i.">".$i."</a> ";
}
if($this->page!=$this->pagenum){
$pagestr.="<a href=".$url." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" p=".($this->page+1).">下一页</a>";
}
if($this->page+5<$this->pagenum){
$pagestr.="<a href=".$url." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" p=".$this->pagenum.">尾页</a> ";
}
return $pagestr;
}
}
// 测试代码
$page = new page(100,10);
$str=$page->getPage();
echo $str;
?>
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