PHP中的错误：警告：mysqli_num_rows（）期望... [英] Error in PHP:warning: mysqli_num_rows() expects...

问题描述

完整错误：

The full error:

Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in __________ on line 16

我的代码:(因隐私问题而被删减）

My code: (Censored for privacy issues)

<?php

session_start();

$con = mysqli_connect('localhost','__________________','__________');

mysqli_select_db($con, '_____________________');

$email = $_POST['email'];
$pws = $_POST['psw'];

$s="select * from 'usertable' where email = '$email' && pws = '$pws'";

$result = mysqli_query($con, $s);

$num = mysqli_num_rows($result);

if($num == 1) {
        header('location:index.html');
    }else{
}

?>

我尝试了什么：



我试过改变mysqli_num_rows（$ result）;到mysqli_result（$ result）;

What I have tried:

I have tried changing mysqli_num_rows($result); to mysqli_result($result);

推荐答案

con = mysqli_connect（' localhost'，' __________________'，' __________'）;

mysqli_select_db（

con = mysqli_connect('localhost','__________________','__________'); mysqli_select_db(

con，' _____________________' ）;

con, '_____________________');

电子邮件 =

email =

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