PHP paging code learning example sharing_PHP tutorial

Copy code The code is as follows:

header("content-type:text/html; charset=utf-8");
//Database connection
$conn = mysql_connect("localhost", "root", "111") or die("not connnected : ".mysql_error());
mysql_select_db("test", $conn);
mysql_query("set names utf8");

//Query how many rows of data there are in total
$sql1 = "select count(*) from user";
$ret1 = mysql_query($sql1);
$row1 = mysql_fetch_row($ret1);
$tot = $row1[0];

//How many rows of data per page
$length = 5;
//Total number of pages
$totpage = ceil($tot / $length);

//Current page number
$page = @$_GET['p'] ? $_GET['p'] : 1;
//limit lower limit
$offset = ($page - 1) * $length;

echo "

";
echo "

php padding

";
echo "";
echo "";
echo "";
echo "";
echo "< th>PASS";
echo "";

//Display the queried data in a table
$sql2 = "select * from user order by id limit {$offset}, {$length}";
$ret2 = mysql_query($sql2) ;
while ($row2 = mysql_fetch_assoc($ret2)) {
echo "

";
echo "";
     echo "";
}

echo "

ID	USER
{$row2['id']}	{$row2['name']}	{$row2['pass']}

";

//Previous page and next page
$prevpage = $page - 1;
if ($page >= $totpage) {
$nextpage = $totpage;
} else {
$nextpage = $page + 1;
}

//Jump
echo "

Previous page|Next page

";
echo "";

Core points:

<1>"$sql2 = "select * from user order by id limit {$offset}, {$length}";", the relationship between $offset, $length and the number of pages.

<2>How to obtain the previous page and next page, and the critical point.

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