PHP paging principle and implementation code (graphic tutorial)

[code] // 1 connect to database $link = @mysql_connect("localhost", "root", "") or die ("connect to mysql failed"); @mysql_select_db("csxdb", $link) or die ("not find db student"); mysql_query("set names 'GBK'"); // 2 path of local page $url = $_SERVER["REQUEST_URI"]; $arr = parse_url($url); $path = $arr[path]; // 3 total num of records $rset = mysql_query("select * from student"); $nums = mysql_num_rows($rset); // 4 some initialized variable $nPageSize = 5; // page size $nsPos = 0; // start postion of record $nPage = 1; // current page order // 5 if request if ($_GET