我的登陆代码
<form action="logincheck.php" method="post">
用户名：<input type="text" name="User_name" />
<br />
密码：<input type="password" name="Pwd" />
<br />
<input type="submit" name="submit" value="登陆" />
<a href="register.php">注册</a>
</form>
<?php
$User_name=$_POST['User_name'];
$pwd = $_POST['Pwd'];
$sql = "select User_name,Pwd from table user_info where User_name = '$_POST[User_name]' and Pwd = '$_POST[Pwd]'";
$con = new mysqli("localhost","root","root","student");
$result = $con->query($sql); //进行数据库查询
$row = mysqli_num_rows($result);
if($row > 0)
{
echo "该用户存在"; //向前端返回数据
}
else
{
echo "该用户不存在"; //向前端返回数据
}
?>
我想验证用户名和密码 但是会报错mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in H:\php\PHPTutorial\WWW\dianyingyuan\logincheck.php on line 7
该用户不存在
有没有大神能帮解决一下
