PHP Introductory Learning Knowledge Point two PHP simple pagination process and principle _php Foundation

<?php
Require '.. /inc/conn.php ';
?>
<?php

Initial parameter settings
$pagesize = 5; Paging size
$pagenum = 1; Default to First page


First step: Get the current page
if ($_get) {
if ($_get[' Pagenum ']) {
$pagenum =$_get[' Pagenum '];
}
}
Step two: Get the list of content for the current page

$sql = "SELECT * from Message Limit". ($pagenum-1) * $pagesize. ", $pagesize";
$result =mysql_query ($sql);

while (($row =mysql_fetch_array ($result)) ==true) {
Echo ' }

Step three: Get the number of records
$sql = "SELECT ID from Message";
$result =mysql_query ($sql);
$rownum =mysql_num_rows ($result);

Fourth Step: Count the number of pages
if (($rownum% $pagesize) ==0) {
$pagecount = $rownum/$pagesize;
}else{
$pagecount = (int) ($rownum/$pagesize);
}

Fifth step: Get pagination link
$url =$_server["Request_uri"];
$url =parse_url ($url);
$url = $url ["Path"];

Sixth step: Output page Links

if ($pagenum ==1) {
echo "[first] [prev]";
}else{
echo [<a href=\ "$url? pagenum=1\" > First page </a>] [<a href=\ "$url? pagenum=". ( $pagenum-1). " \ "> previous page </a>]";
}


if ($pagecount = = $pagenum) {
echo "[Next page] [last page]";
}else{
echo [<a href=\ "$url? pagenum=". ( $pagenum + 1). " \ > Next page </a>] [<a href=\ "$url? pagenum=". ( $pagecount). " \ "> last page </a>]";
}

?>