In-depth analysis of PHP article content pagination_PHP tutorial

$pager = new pager($totalPage,$currentPage); // $pager object
echo $pager->showpager(); // Output paging

This page displays the constructor of the class
/*

/**
 * 示例：
 *  * require_once("pager.class.php");
 * $subPages=new pager($totalPage,$currentPage);
 * echo $subPages->showpager();
 * ?>
 **/
class pager{

var $each_disNums;//The number of items displayed on each page
var $nums;//Total number of entries
var $current_page;//The currently selected page
var $sub_pages;//The number of pages displayed each time
var $pageNums;//Total number of pages
var $page_array = array();//Array used to construct paging
var $subPage_link; //Link to each page
var $subPage_type;//Show paging type
var $_lang = array(
'index_page' => 'Homepage',
'pre_page' => 'Previous page',
'next_page' => 'Next page',
'last_page' => 'Last page',
'current_page' => 'Current page:',
'total_page' => 'Total number of pages:',
'current_show' => 'Current display:',
'total_record' => 'Total number of records:'
);
/*
__construct is the constructor of SubPages, which is used to run automatically when creating a class.
@total_page Total number of pages
@current_num The currently selected page
@sub_pages The number of pages displayed each time
@subPage_link Link to each page
@subPage_type Display the type of paging

When @subPage_type=1, it is normal paging mode
Example: A total of 4523 records, 10 records displayed on each page, current page 1/453 [Home] [Previous page] [Next page] [Last page]
When @subPage_type=2, it is the classic paging style
Example: Current page 1/453 [Home] [Previous page] 1 2 3 4 5 6 7 8 9 10 [Next page] [Last page]
*/
function __construct($total_page,$current_page,$sub_pages=10,$subPage_link='',$subPage_type=2){
$this->pager($total_page,$current_page,$sub_pages,$subPage_link,$subPage_type);
}

function pager($total_page,$current_page,$sub_pages=10,$subPage_link='',$subPage_type=2){
if(!$current_page){
$this->current_page=1;
}else{
$this->current_page=intval($current_page);
}
$this->sub_pages=intval($sub_pages);
$this->pageNums=ceil($total_page);
if($subPage_link){
if(strpos($subPage_link,'?page=') === false AND strpos($subPage_link,'&page=') === false){
$subPage_link .= (strpos($subPage_link,'?') === false ? '?' : '&') . 'page=';
}
}
$this->subPage_link=$subPage_link ? $subPage_link : $_SERVER['PHP_SELF'] . '?page=';
$this->subPage_type = $subPage_type;
}

/*
The show_SubPages function is used in the constructor. And used to determine what kind of paging to display
*/
function showpager(){
if($this->subPage_type == 1){
Return $this->pagelist1();
}elseif ($this->subPage_type == 2){
Return $this->pagelist2();
}
}


/*
Function used to initialize the paginated array.
*/
function initArray(){
for($i=0;$i<$this->sub_pages;$i++){
$this->page_array[$i]=$i;
}
Return $this->page_array;
}


/*
​ construct_num_Page This function is used to construct the displayed entries
Even: [1][2][3][4][5][6][7][8][9][10]
*/
function construct_num_Page(){
  if($this->pageNums < $this->sub_pages){
   $current_array=array();
   for($i=0;$i<$this->pageNums;$i++){
    $current_array[$i]=$i+1;
   }
  }else{
   $current_array=$this->initArray();
   if($this->current_page <= 3){
    for($i=0;$i      $current_array[$i]=$i+1;
    }
   }elseif ($this->current_page <= $this->pageNums && $this->current_page > $this->pageNums - $this->sub_pages + 1 ){
    for($i=0;$i      $current_array[$i]=($this->pageNums)-($this->sub_pages)+1+$i;
    }
   }else{
    for($i=0;$i      $current_array[$i]=$this->current_page-2+$i;
    }
   }
  }
  
  return $current_array;
 }
 
 /*
 构造普通模式的分页
 共4523条记录,每页显示10条,当前第1/453页 [首页] [上页] [下页] [尾页]
 */
 function pagelist1(){
  $subPageCss1Str="";
  $subPageCss1Str.= $this->_lang['current_page'] . $this->current_page." / " .$this->pageNums."   ";
  if($this->current_page > 1){
   $firstPageUrl=$this->subPage_link."1";
   $prewPageUrl=$this->subPage_link.($this->current_page-1);
   $subPageCss1Str.="{$this->_lang['index_page']} ";
   $subPageCss1Str.="{$this->_lang['pre_page']} ";
  }else {
   $subPageCss1Str.="{$this->_lang['index_page']} ";
   $subPageCss1Str.="{$this->_lang['pre_page']} ";
  }
  
  if($this->current_page < $this->pageNums){
   $lastPageUrl=$this->subPage_link.$this->pageNums;
   $nextPageUrl=$this->subPage_link.($this->current_page+1);
   $subPageCss1Str.=" {$this->_lang['next_page']} ";
   $subPageCss1Str.="{$this->_lang['last_page']} ";
  }else {
   $subPageCss1Str.="{$this->_lang['next_page']} ";
   $subPageCss1Str.="{$this->_lang['last_page']} ";
  }
  
  return $subPageCss1Str;
 }
 
 
 /*
 构造经典模式的www.111cn.net分页
 当前第1/453页 [首页] [上页] 1 2 3 4 5 6 7 8 9 10 [下页] [尾页]
 */
 function pagelist2(){
  $subPageCss2Str="";
  $subPageCss2Str.=$this->_lang['current_page'] . $this->current_page."/" . $this->pageNums." ";
  
  if($this->current_page > 1){
   $firstPageUrl=$this->subPage_link."1";
   $prewPageUrl=$this->subPage_link.($this->current_page-1);
   $subPageCss2Str.="{$this->_lang['index_page']} ";
   $subPageCss2Str.="{$this->_lang['pre_page']} ";
  }else {
   $subPageCss2Str.="{$this->_lang['index_page']} ";
   $subPageCss2Str.="{$this->_lang['pre_page']} ";
  }
  
  $a=$this->construct_num_Page();
  for($i=0;$i    $s=$a[$i];
   if($s == $this->current_page ){
     $subPageCss2Str.="[".$s."]";
   }else{
     $url=$this->subPage_link.$s;
     $subPageCss2Str.="[".$s."]";
   }
  }
  
  if($this->current_page < $this->pageNums){
   $lastPageUrl=$this->subPage_link.$this->pageNums;
   $nextPageUrl=$this->subPage_link.($this->current_page+1);
   $subPageCss2Str.=" {$this->_lang['next_page']} ";
   $subPageCss2Str.="{$this->_lang['last_page']} ";
  }else {
   $subPageCss2Str.="{$this->_lang['next_page']} ";
   $subPageCss2Str.="{$this->_lang['last_page']} ";
  }
  return $subPageCss2Str;
 }
 
 
 /*
    __destruct析构函数，当类不在使用的时候调用，该函数用来释放资源。
 */
 function __destruct(){
  unset($each_disNums);
  unset($nums);
  unset($current_page);
  unset($sub_pages);
  unset($pageNums);
  unset($page_array);
  unset($subPage_link);
  unset($subPage_type);
 }
}
?>