php - mysqli_connect不报错，但此后操作都显示not a valid MySQL-Link resource
$connect = mysqli_connect("host","user","password","db") or die("Error " . mysqli_error($connect));
$result = mysql_query('select * from admin',$connnet);
print(mysql_num_rows($result));
mysql_close();
报错：
Warning: mysql_query(): supplied argument is not a valid MySQL-Link resource
Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource
Warning: mysql_close(): no MySQL-Link resource supplied
而使用面向对象方法则没有问题
请问这是什么问题？
