*大家都玩过吧,它上面有个“随机条目”,如果我们本地用的是mysql,也想实现同样的功能,怎么实现这个功能呢? 如何做效率才高呢?
$conn = mysql_connect('127.0.0.1','root','root') or die (mysql_error()); mysql_select_db('test'); mysql_query('SET NAMES UTF8'); $sql = " select count(1) as t from cj_question "; $result = mysql_query($sql); $data = mysql_fetch_assoc($result); $count = empty($data) ? 0 : intval($data['t']); if (empty($count)) { die('表中没有数据'); } $offset = mt_rand(0,$count-1); $sql = " select * from cj_question limit $offset,1 "; $result = mysql_query($sql); $data = mysql_fetch_assoc($result); var_dump($data);