Pagination class - tail page number navigation

Pagination class - tail page number navigation

/**
 * Generate the tail paging navigation of Comment
 * @author Li Jun
 *
*/
class cmtTail{
 private $currentPage;
 private $totalPage;

 /**
 * Generate page number navigation - total control function
 * @param string $currentPage current page number
 * @param string $totalPage total page number
 * @throws Exception If the page number is less than 1, an exception will be thrown
 * @return string
*/
 function __do($currentPage, $totalPage ) {
 $this->currentPage=$currentPage;
 $this->totalPage=$totalPage;
 if($this->totalPage<=10){//The total number of pages is less than or equal to 10 pages
 if( $this->currentPage==1){//The current page is the first page
 $str='previous page'.$this->currentTag();
 for ($i = 2; $i < = $this->totalPage; $i++) {
 $str=$str.$this->commonTag($i);
 }
 $str=$str.$this->next();
 } elseif ($this->currentPage==$this->totalPage){//Jumped to the last page
 $str=$this->up();
 for ($i = 1; $i < ;= $this->totalPage-1; $i++) {
 $str=$str.$this->commonTag($i);
 }
 $str=$str.$this->currentTag() ;
 $str=$str.$this->next();
 }else{
 $str=$this->up();
 for($i=1; $i<$this-> currentPage; $i++){
 $str=$str.$this->commonTag($i);
 }
 $str=$str.$this->currentTag();//Generate the current page tag
 for ($i = $this->currentPage+1; $i <= $this->totalPage; $i++) {
 $str=$str.$this->commonTag($i);
 }
 $str=$str.$this->next();
 }
 }elseif ($this->totalPage>10){//The page number is greater than 10
 if($this->currentPage==1){ //8+2
 $str='previous page'.$this->currentTag();
 for ($i = 2; $i <= 8; $i++) {
 $str=$str. $this->commonTag($i);
 }
 $str=$str.'...';//Add ellipses
 $str=$str.$this->commonTag($this->totalPage -1);
 $str=$str.$this->commonTag($this->totalPage);
 }elseif($this->currentPage==$this->totalPage) {//currently Last page
 $str=$this->up();
 $str=$str.$this->commonTag(1);
 $str=$str.'...';//Add ellipses
 for ($i = $this->totalPage-6; $i < $this->totalPage; $i++) {
 $str=$str.$this->commonTag($i);
 }
 $str=$str.$this->currentTag();
 $str=$str.$this->next();
 }else {
 if ($this->currentPage<6) {
 $str=$this->up();
 for ($i = 1; $i < $this->currentPage; $i++) {
 $str=$str.$this->commonTag($ i);
 }
 $str=$str.$this->currentTag();
 for ($i = $this->currentPage+1; $i <= 7; $i++) {
 $str =$str.$this->commonTag($i);
 }
 $str=$str.'...';//Add ellipses
 $str=$str.$this->commonTag($this ->totalPage);
 $str=$str.$this->next();
 }else {
 if ($this->currentPage>=$this->totalPage-4) {
 $str =$this->up();
 $str=$str.$this->commonTag(1);
 $str=$str.'...';//Add ellipses
 for ($i = $this->totalPage-6; $i < $this->currentPage; $i++) {
 $str=$str.$this->commonTag($i);
 }
 $str=$str .$this->currentTag();
 for ($i = $this->currentPage+1; $i <= $this->totalPage; $i++) {
 $str=$str.$this ->commonTag($i);
 }
 $str=$str.$this->next();
 }elseif ($this->currentPage<$this->totalPage-4){// 1+5+1
 $str=$this->up();
 $str=$str.$this->commonTag(1);
 $str=$str.'...';// Add ellipsis
 $str=$str.$this->commonTag($this->currentPage-2);
 $str=$str.$this->commonTag($this->currentPage-1);
 $str=$str.$this->currentTag();
 $str=$str.$this->commonTag($this->currentPage+1);
 $str=$str.$this- >commonTag($this->currentPage+2);
 $str=$str.'...';//Add ellipses
 $str=$str.$this->commonTag($this-> totalPage);
 $str=$str.$this->next();
 }
 };
 }
 }elseif ($this->totalPage<=0){
 throw new Exception("Page impossible Less than 1");
 }
 return $str;
 }
	/**
 * General tag
 * @param int $param page number
 * @return string
*/
	function commonTag($param) {
		return ''.$param.'';
	}
	/**
 * Generate current page label
 * @param int $param page number
 * @return string
*/
	function currentTag() {
		return ''.$this->currentPage.'';
	}
	/**
 * Generate next page label
 * @param int $param Next page page number
 * @return string
*/
	function next() {
		if ($this->currentPage==$this->totalPage) {
			return '下一页';
		}
		return '下一页';
	}
	/**
 * Generate previous page label
 * @param int $param Previous page page number
 * @return string
*/
	function up() {
		if ($this->currentPage==1){
			return '上一页';
		}else{
			return '上一页';
		}
	}
	/**
 * Instantiate cmtTail,
 * Function: Generate tail paging navigation of Comment
 * @param string $currentPage current page number
 * @param string $totalPage total number of pages
 * @return string return html tag string
*/
	static function GO($currentPage, $totalPage) {
		$p=new cmtTail();
		return $p->__do($currentPage, $totalPage);
	}
}