CI framework simple paging class

The examples in this article describe the usage of simple paging classes in the CI framework. Share it with everyone for your reference, the details are as follows:

/** 
 * 
 * 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= ' '; 
  var $cur_tag_close= ''; 
  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 .= $this->first_tag_open.'首页'.$this->first_tag_close; 
    } 
    //上一页 
    if($page_num > 1) 
    { 
      $n = $page_num - 1; 
      $output .= $this->prev_tag_open.'上一页'.$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 .= $this->cur_tag_open.''.$i.''.$this->cur_tag_close; 
      }else if($i >= $pl && $i <= $pr) 
      { 
        $output .= $this->num_tag_open.''.$i.''.$this->num_tag_close; 
      } 
    } 
    //下一页 
    if($page_num < $pages) 
    { 
      $n = $page_num + 1; 
      $output .= $this->next_tag_open.'下一页'.$this->next_tag_close; 
    } 
    //末页 
    if($page_num < $pages) 
    { 
      $output .= $this->last_tag_open.'末页'.$this->last_tag_close; 
    } 
 
    $output.=$this->full_tag_close; 
    return $output; 
  } 
}

Call in the controller

$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();

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){ 
      $pagestr = "首页 "; 
    } 
    if($this->page!=1){ 
      $pagestr.= "上一页"; 
    } 
     
    for($i=$start;$i<=$end;$i++){ 
      $pagestr.= "".$i." ";            
    } 
    if($this->page!=$this->pagenum){ 
      $pagestr.="下一页"; 
       
    } 
    if($this->page+5<$this->pagenum){ 
      $pagestr.="尾页 "; 
    } 
    return $pagestr;   
  } 
   
} 
// 测试代码 
$page = new page(100,10); 
$str=$page->getPage(); 
echo $str; 
?>

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