《mysql_num_rows($s)》 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
<html xmlns="http://www.w3.org/1999/xhtml";>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>

<body>
<?php 
$conn=mysql_connect("localhost","root","haifeng");
mysql_select_db("haifeng",$conn);
mysql_query("set names gb2312");
$sql=mysql_query("select * from testhaifeng");
$nums=mysql_num_rows($sql);
echo $nums."条";
?>


</body>
</html>