php - PHP无法将数据插入MYSQL数据库。改为插入空白行

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“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP
                                
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我到过Google遍地，一直在努力弄清楚为什么这种情况一直在发生。我知道在此网站上也曾提出过类似的问题，但是他们的回答对我来说并不算幸运。它确实连接到数据库，但不显示记录（每列为空记录）。 php代码中有额外注释掉的部分用于测试。任何帮助表示赞赏。

这是HTML表单

<form action="../controller/register1.php" method="POST" >
<fieldset>
    First Name&nbsp;<input class="inputs" type="text" name="firstname" placeholder="Enter your firstname" required>
    <br>
    Last Name &nbsp;<input class="inputs" type="text" name="lastname" placeholder="Enter your lastname" required>
    <br>
    User Name <input class="inputs" type="text" name="username" placeholder="Enter your username" required>
    <br>
    Password &nbsp;&nbsp;<input class="inputs" type="password" name="password" required>
    <br>
    Email &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input class="inputs" type="text" name="email" >
    <br>
    <input class="inputs" type="submit" name="submit" value="Register" />

</fieldset>

这是PHP

<?php

$connection = mysqli_connect("localhost","charcoun_donaldh","Rusty1992","charcoun_phplogin","3306") or die("Could not connect!");

if (mysqli_connect_errno()) {
    echo "Failed to connect to MySQL: " . mysqli_connect_error();
    }

//$firstname = stripslashes($firstname);
$firstname = mysqli_real_escape_string($connection, $_POST['$firstname']);

//$lastname = stripslashes($lastname);
$lastname = mysqli_real_escape_string($connection, $_POST['$lastname']);

//$username = stripslashes($username);
$username = mysqli_real_escape_string($connection, $_POST['$username']);

//$password = stripslashes($password);
$password = mysqli_real_escape_string($connection, $_POST['$password']);

//$email = stripslashes($email);
$email = mysqli_real_escape_string($connection, $_POST['$email']);


$sql = "INSERT INTO users (firstname, lastname, username, password, email) 
            VALUES ('$firstname','$lastname','$username','$password','$email')"; //Use ".md5($password)." for encrypted
//$result = mysqli_query($connection, $sql);

if(!mysqli_query($connection, $sql)){
        die('Error: ' . mysqli_error($connection));
        }
else{
        echo "<br/><h3>You have been registered successfully. Click here to return <a href='../view/index.php'>Home.</a></h3>";
    }

？>

最佳答案

检索POST变量时，请删除$。例如，将$_POST['$firstname']更改为$_POST['firstname']。另外，如果您尝试使用$_POST['firstname']，则应该获得


  未定义索引：$ firstname


错误。如果没有错误，请检查您是否具有display errors turned on。

关于php - PHP无法将数据插入MYSQL数据库。改为插入空白行，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36969384/

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Answer 1

检索POST变量时，请删除$。例如，将$_POST['$firstname']更改为$_POST['firstname']。另外，如果您尝试使用$_POST['firstname']，则应该获得


  未定义索引：$ firstname


错误。如果没有错误，请检查您是否具有display errors turned on。