Detailed explanation of php+mysql paging code_PHP tutorial

$perpagenum = 10;//Define each page display Several pieces
$total = mysql_fetch_array(mysql_query("select count(*) from a"));//Query how many pieces of data there are in the database
$Total = $total[0]; >$Totalpage = ceil($Total/$perpagenum); // Round up and round
if(!isset($_GET['page'])||!intval($_GET['page'])| |$_GET['page']>$Totalpage)//Four possible states of page 
{ 
 $page=1; 
} 
else 
{ 
 $page =$_GET['page']; //If the above four conditions are not met, the value of page is $_GET['page']
}
$startnum = ($page-1)*$perpagenum ;//Start number of items 
$sql = "select * from a order by id limit $startnum,$perpagenum";//Query the required number of items 
echo $sql." 
"; 
$rs = mysql_query($sql);
$contents = mysql_fetch_array($rs);
if($total) If $total is not empty, execute the following statement 🎜>                                             "center">                                                                        > ; 
 
 name: 
  
  
 
                                                                           //Previous page
$next = $page + 1;//Next page
echo "There are ".$Total." records, and each page has ".$perpagenum." records, Total ".$Totalpage." pages ";                                                                         Home";
echo " Previous page ";
}
if($page != $Totalpage)
{
echo " Next page";
echo " Last page";
}
}
else If $total is empty, No message will be output
{
echo "No message< ;/center>";
}
?>

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