A useful php paging class

/**
Class to paginate queries
@link http://bbs.it-home.org
*/
class paging
{
 private $pageSize; //The number of items displayed on each page. The default is 10 items.
 private $totlePage; //How many records are there in total? private $dbConnection; //Database connection
 private $nowPageIndex; //The number of pages currently displayed
 private $show; //Use that method to display navigation, the default method It is the method of using show1() Home Page | Previous Page | Next Page | Last Page.
 /**
 Constructor to establish a database connection
 ＠$pageSizeP The number of items displayed on each page is 10 by default.
 ＠$show Which method to use to display navigation, the default method is to use show1() Home page | Previous page | Next page | Last page.
*/
 public function _construct($pageSizeP=10,$show="show1")
 {
 $this->dbConnection = @mysql_connect("localhost","username","password" );
 if($this->dbConnection)
 {
 die("");
 }
 mysql_select_db($this->dbConnection,"databaseName");
 $this->show = $show;
 $this->pageSize = $pageSizeP;
 }
 /**
 Destructor, closes the database connection.
*/
 public function _destruct()
 {
 @mysql_close($this->dbConnection);
 }
 /**
 Query the database and display the number of records in the database.
 ＠$sql SQL statement to query the database.
 ＠$charset queries the character set used by the database. The default is UTF-8.
 ＠return Returns the result of database query, saves it as an array, and then returns it, the number of items is uncertain.
 */
 public function querySQL($sql,$charset="UTF-8")
 {
 mysql_query("SET NAMES ".$charset);
 $rs = @mysql_query($sql);
 if(!$rs )
 {
 die("");
 }
 $num = @mysql_num_rows($rs);
 $this->totlePage= ceil($num/$this->pageSize);
 $this-> nowPageIndex = (isset($_POST['page']) || $_POST['page'] >= 1):$_POST['page']?1;
 if($this->nowPageIndex >$ this->totlePage)
 {
 $this->nowPageIndex = $this->totlePage;
 }
 $start = ($this->nowPageIndex - 1)*$this->pageSize;
 mysql_free_result( $rs);
 $sql .= "LIMIT $start,$this->pageSize";
 $rs = @mysql_query($sql);
 if(!$rs)
 {
 die("");
 }
 $rows = array();
 while($row = @mysql_fetch_row($rs))
 {
 $rows[] = $row;
 }
 @mysql_free_result($rs);
 return $rows;
 }
 /**
 Show navigation orchid.
 ＠$arg Parameters for calling the function that displays navigation.
 $img1 is an array that saves the images of navigation connections. used when calling show1().
 $size is the number of pages displayed in one row of the navigation blueprint. used when calling show2().
*/
 public function show($arg)
 {
 $func = $this->show;
 $this->$func($arg);
 }
 /**
 The navigation is displayed in the order of Home Page | Previous Page | Next Page | Last Page.
 ＠$img1 The image path array corresponding to the home page | previous page | next page | last page. The default is NULL, which does not display images.
    */
    private function show1($img1 = NULL)
    {
        $url =  $_SERVER['PHP_SELF']."?".$_SERVER['QUERY_STRING'];
        $str = "            
当前$this->nowPageIndex页／共$this->totlePage页";
        if(isset($img) || $img != NULL)
        {
            $str .= "
            $str .= ">
            $str .= ">
            $str .= ">";        }        else        {            $str .= "首页>




            $str .= ">上一页
            $str .= ">下一页
            $str .= ">末页";        }        echo $str;    }    /** Take 1｜2｜3｜. . . to display navigation.  ＠$size The number of pages displayed in each row of the navigation orchid. The default is 10. */    private function show2($size =10)    {        $url =  $_SERVER['PHP_SELF']."?".$_SERVER['QUERY_STRING'];        $str = "










";        for($index = 1 ; $index <= $this->totlePage ; $index++)        {                       $str .= "";            if($index == $size)            {                $str .="";            }        }        $str .= "



            $str .= "$index





";
        echo $str;
    }
}
?>