Ajax implements refresh-free paging (php)_PHP tutorial

";
$page = (isset($_REQUEST['page'])) ? $_REQUEST['page'] : 1;
$offset = ($ page - 1) * $num;
$result = mysql_query("SELECT COUNT(*) FROM client");
$total = mysql_fetch_row($result);
$total = $total[0] ;
$pagenum = ceil($total / $num);
$page = min($pagenum, $page); //Get the home page
$prepg = $page - 1; //Previous Page
if ($prepg <= 1)
$prepg = 1;
$nextpg = ($page == $pagenum ? 1 : $page + 1); //Next page
//If there is only one page, jump out of the function:
if ($pagenum <= 1)
return false;
$sql = "SELECT `name`,`content` FROM `client` LIMIT " . $offset . "," . $num;
$res = mysql_query($sql);
while ($content = mysql_fetch_row($res)) {
$con .= "
• $content[0]: $content[1]
";
}
$con .= "

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