PHP paging function_PHP tutorial

/*
需求，建立一个test数据库，在里边建一个test表，里面就
只要id字段，输入一下数据就可以啦。。
由于水平有限，难免出错。。
*/
$conn = mysql_connect("localhost","root","");

$maxnum = 2; //每页显示记录条数

mysql_select_db("test", $conn);
$query1 = "SELECT COUNT(*) AS totalrows FROM test ";
$result1 = mysql_query($query1, $conn) or die(mysql_error());
$row1 = mysql_fetch_assoc($result1);
$totalRows1 = $row1['totalrows']; //数据集数据总条数
$totalpages = ceil($totalRows1/$maxnum);//计算可分页总数，ceil()为上舍函数

if(!isset($_GET['page']) || !intval($_GET['page']) || $_GET['page'] > $totalpages) $page = 1;  //对3种出错进行默认处理
//在url参数page不存在时，page不为10进制数时，page大于可分页数时，默认为1
else $page = $_GET['page'];

$startnum = ($page - 1)*$maxnum; //从数据集第$startnum条开始取，注意数据集是从0开始的

$query = "SELECT * FROM test LIMIT $startnum,$maxnum";//选择出符合要求的数据 从$startnum条数据开始，选出$maxnum行
$result = mysql_query($query, $conn) or die(mysql_error());
$row = mysql_fetch_assoc($result);

?>

  
    
  
   do {
?>
  
    

分页示例

  

echo "Total$totalRows1record"; 🎜>                                                                                                                 //Next page
$maxpages = 4;//When processing paging << < 1 2 3 4 > >>Display 4 pages
$pagepre = 1;//If the current page If it is 4, the previous $pagepre page should also be displayed, such as << < 3 /4/ 5 6 > >> Display page 3

if($page != 1) { echo "<< ";
echo "< ";}

if($maxpages>=$totalpages) //If the total records are not enough Display 4 pages
{$pgstart = 1;$pgend = $totalpages;}//Print processing of different pages
elseif(($page-$pagepre-1+$maxpages)>$totalpages) //Just like the total number of pages is 6 and the current number is 5, the previous 3 4 should be displayed, not just 4
{$pgstart = $totalpages - $maxpages + 1;$pgend = $totalpages; }
else{
$pgstart=(($page<=$pagepre)?1:($page-$pagepre));//When the current page is 1, it will only be 1 2 3 4 > >>Instead of 0 1 2 3 > >>
$pgend=(($pgstart==1)?$maxpages:($pgstart+$maxpages-1));


for($pg=$pgstart;$pg<=$pgend;$pg++){ //Jump menu
if($pg == $page) echo "$pg ";
else echo "< ;a href="".$_SERVER['PHP_SELF']."?page=$pg">$pg "; > {echo "> ";
echo ">> ";}
        ?>
          
          选择
                     echo "".$pg1."";
          }?>
      
    

    没有任何记录

  
  



mysql_free_result($result1);
mysql_free_result($result);
?>

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