PHP将空白信息发送到数据库

Question

我正在将Unity表单与PHP结合使用，以将数据发送到数据库，我可以成功地在其中输入信息并到达数据库，但是问题是，如果字段为空，它也会发送数据。

我正在尝试使用isset方法来防止这种情况，但是它似乎没有用。 有人可以为我再次检查吗？

到达数据库的数据图像

统一形式的形象

<?php

    if(!isset($_POST['usernamePost'], $_POST['passwordPost'], $_POST['emailPost']))
    {
        echo "This is not working";
    }
    else
    {
    //Enter the data into the database
    $username = filter_var($_POST['usernamePost'], FILTER_SANITIZE_STRING);
    $password = filter_var($_POST['passwordPost'], FILTER_SANITIZE_STRING);
    $email = filter_var($_POST['emailPost'], FILTER_SANITIZE_STRING);

    //variable for connection
    $servername = "localhost";
    $server_username = "root";
    $server_password = "";
    $dbName = "ontrigger_game";

        try
        {
            //connection to the database
            $dbhandle = mysqli_connect($servername, $server_username, $server_password) 
              or die("Unable to connect to MySQL");
            echo "Connected to MySQL<br>";

            //select a database to work with
            $selected = mysqli_select_db($dbhandle, $dbName)
                    or die("Could not select database");

            $sql = "INSERT INTO users (username, password, email)
                VALUES ('".$username."','".$password."','".$email."')";
            if(!mysqli_query($dbhandle, $sql))
            {
              die('Error: ' . mysqli_error());
            }
            echo "1 record added";

            //close the connection
            mysqli_close($dbhandle);

        } 
        catch (Exception $ex) 
        {

        }
    }
?>

Answer 1

您还应该使用empty()方法检查其是否为空

if (!isset($_POST['usernamePost']) && empty($_POST['usernamePost'] )) {

// error message here

} else {

// What you want to do if not empty and is set.

}

注意：请使用&&运算符，而不要使用逗号