PHP 比较变量每次都返回 false

Question

我有这个脚本来检查提交的表单。

它检查所有字段是否都已填写，并检查用户之前是否提交过表单。它还检查输入的数据是否已在数据库中。

当我尝试检查输入的数据是否在数据库中时，它总是返回false。

我的问题是:如何有效地检查 POST 值是否相同？

代码:

<?php
error_reporting(E_NOTICE ^ E_ALL);
$Name = $_POST['name'];
$ID = $_POST['id'];
$Topic_1 = $_POST['1'];
$Topic_2 = $_POST['2'];
$Topic_3 = $_POST['3'];
$Topic_4 = $_POST['4'];
$Topic_5 = $_POST['5'];
$Topic_6 = $_POST['6'];
$Topic_7 = $_POST['7'];
$Topic_8 = $_POST['8'];
$Topic_9 = $_POST['9'];
$Topic_10 = $_POST['10'];
$Topic_11 = $_POST['11'];
$Topic_12 = $_POST['12'];
$Topic_13 = $_POST['13'];
$Topic_14 = $_POST['14'];
$Topic_15 = $_POST['15'];
$IP = $_SERVER['REMOTE_ADDR'];

$Connect = new mysqli("127.0.0.1", "root", "", "Data");
$Check = 'SELECT * FROM Submissions WHERE School_ID = "'.$ID.'" AND IP = "'.$IP.'"';
$Insert = 'INSERT INTO Submissions (Name, School_ID, Topic_1, Topic_2, Topic_3, Topic_4, Topic_5, Topic_6, Topic_7, Topic_8, Topic_9, Topic_10, Topic_11, Topic_12, Topic_13, Topic_14, Topic_15, IP) VALUES ("'.$Name.'", "'.$ID.'", "'.$Topic_1.'", "'.$Topic_2.'", "'.$Topic_3.'", "'.$Topic_4.'", "'.$Topic_5.'", "'.$Topic_6.'", "'.$Topic_7.'", "'.$Topic_8.'", "'.$Topic_9.'", "'.$Topic_10.'", "'.$Topic_11.'", "'.$Topic_12.'", "'.$Topic_13.'", "'.$Topic_14.'", "'.$Topic_15.'", "'.$IP.'")';

if($Name && $ID != "")
{
    if($Result = $Connect->query($Check))
    {
        $Rows = $Result->num_rows;
        if($Rows == 0)
        {
            if($_POST != $_POST)
            {
                if($Go = $Connect->prepare($Insert))
                {
                    if($Go->execute())
                    {
                        echo 'Thanks';
                    }
                    else
                    {
                        echo 'There Was An Error';
                    }
                }
                else
                {
                    echo 'There Was An Error';
                }
            }
            else
            {
                echo 'No Two Values Can Match.';
            }
        }
        else
        {
            echo 'You Cant Vote Twice.';
        }
        $Result->close();
    }
    else
    {
        echo 'There Was An Error.';
    }
}
else
{
    echo 'Please Fill Out All Fields';
}
$Connect->close();

Answer 1

您的 if 语句应如下所示

if($name != "" && $check != "")