警告:mysql_num_rows() 期望参数 1 是资源，给定的对象
问题描述：
$q="SELECT * FROM tbl_quevote WHERE que_id = '".$qid."' and voteby='".$uid."'";
$result = $mysqli->query($q) or die(mysqli_error($mysqli));
$num_rows = mysql_num_rows($result);
echo $num_rows;
错误:
警告:mysql_num_rows() 期望参数 1 是资源，对象在 C:\xampp\htdocs\shizin\voting.php 第 13 行
Warning: mysql_num_rows() expects parameter 1 to be resource, object given in C:\xampp\htdocs\shizin\voting.php on line 13
如何检查结果是否为空?
How to check result is empty?
答
$num_rows = $result->num_rows;