仅当php语句为true时，才在其他.php文件中显示DIV

快速提问。我是新手所以， 注册成功时，我希望显示带有消息（值）的

。 所以，如果一切正常，那么应该只显示在另一个带有HTML代码的.php文件中

我试着把它还给你，但不知道如何用正确的方法

注意：

• 现在我使用的是

  global

  ，但我想把它扔掉

所以我在

function.php

中有一个函数，如果

function createUser(){

    global $welcome;

    $connection = connectDB();
    $username = $_POST['username'];
    $email = $_POST['email'];
    $password = $_POST['password'];
    $passwordConfirm = $_POST["passwordConfirm"];

    $username = mysqli_real_escape_string($connection, $username);
    $email = mysqli_real_escape_string($connection, $email);
    $password = mysqli_real_escape_string($connection, $password);
    $passwordConfirm = mysqli_real_escape_string($connection, $passwordConfirm);

    if($_POST['password'] !== $_POST['passwordConfirm']){
        $error = exit("Password does not match.");
    } 

    $hashFormat = "$2y$10$";
    $salt = "iusesomecrazystrings22"; 
    $hash = $hashFormat . $salt; 

    $password = crypt($password, $hash);

    $query = "INSERT INTO users(username, email, password) VALUES ('$username', '$email', '$password')";

    $result = mysqli_query($connection, $query);

    if(!$result){
        die("Query FAILED " . mysqli_error($connection));
    } else{
        $welcome = "Registration Success";
    }

}

在另一个文件中，我有如下内容：

<?php

include 'functions.php';

global $welcome;

if(isset($_POST['submit'])){
    createUser();
}
?>
<div class="row justify-content-md-center">

<form action="register.php" method="post">

    <div class="form-group">
        <input type="text" name="username" class="form-control" placeholder="Username" style="text-align: center" required>
    </div>

    <div class="form-group">
        <input type="email" name="email" class="form-control" placeholder="Email" style="text-align: center" required>
    </div>

    <div class="form-group">
        <input type="password" name="password" class="form-control" placeholder="Password" style="text-align: center" required>
    </div>

    <div class="form-group">
        <input type="password" name="passwordConfirm" class="form-control" placeholder="Confirm Password" style="text-align: center" required>
    </div>

    <div class="row justify-content-md-center">
        <input type="submit" name="submit" value="SIGN UP" class="btn btn-primary">
    </div>

    <p></p>

    <div class="row justify-content-md-center">
        <?php echo $welcome; ?>
    </div>

</form>

</div>

if(isset($_POST['submit'])){
    $message = createUser();
}

所以我就这样做了

---

我应该如何返回

而不是
$welcome=“注册成功”
，仅当
$result为true时才显示该消息，最后将该消息打印到包含HTML的其他文件中。
您可以从函数返回$message并按如下方式接收该消息：

<?php

include 'functions.php';

global $welcome;

if(isset($_POST['submit'])){
    createUser();
}
?>
<div class="row justify-content-md-center">

<form action="register.php" method="post">

    <div class="form-group">
        <input type="text" name="username" class="form-control" placeholder="Username" style="text-align: center" required>
    </div>

    <div class="form-group">
        <input type="email" name="email" class="form-control" placeholder="Email" style="text-align: center" required>
    </div>

    <div class="form-group">
        <input type="password" name="password" class="form-control" placeholder="Password" style="text-align: center" required>
    </div>

    <div class="form-group">
        <input type="password" name="passwordConfirm" class="form-control" placeholder="Confirm Password" style="text-align: center" required>
    </div>

    <div class="row justify-content-md-center">
        <input type="submit" name="submit" value="SIGN UP" class="btn btn-primary">
    </div>

    <p></p>

    <div class="row justify-content-md-center">
        <?php echo $welcome; ?>
    </div>

</form>

</div>

if(isset($_POST['submit'])){
    $message = createUser();
}

并修改函数createUser，如下所示：

<?php

include 'functions.php';

global $welcome;

if(isset($_POST['submit'])){
    createUser();
}
?>
<div class="row justify-content-md-center">

<form action="register.php" method="post">

    <div class="form-group">
        <input type="text" name="username" class="form-control" placeholder="Username" style="text-align: center" required>
    </div>

    <div class="form-group">
        <input type="email" name="email" class="form-control" placeholder="Email" style="text-align: center" required>
    </div>

    <div class="form-group">
        <input type="password" name="password" class="form-control" placeholder="Password" style="text-align: center" required>
    </div>

    <div class="form-group">
        <input type="password" name="passwordConfirm" class="form-control" placeholder="Confirm Password" style="text-align: center" required>
    </div>

    <div class="row justify-content-md-center">
        <input type="submit" name="submit" value="SIGN UP" class="btn btn-primary">
    </div>

    <p></p>

    <div class="row justify-content-md-center">
        <?php echo $welcome; ?>
    </div>

</form>

</div>

if(isset($_POST['submit'])){
    $message = createUser();
}

更新

function createUser()
{
  // here is your function's body))))

  if ($result) {
     return "Registration Success";
  }

  die("Query FAILED " . mysqli_error($connection));
}

如果我理解正确：

在
createUser（）
中，而不是：

if(!$result){
    die("Query FAILED " . mysqli_error($connection));
} else{
    $welcome = "Registration Success";
}

这样做：

if(!$result){
    die("Query FAILED " . mysqli_error($connection));
}
return true;

在带有HTML的PHP文件中，执行以下操作：

<?php 
    include 'functions.php';

    $userCreated = false;

    if(isset($_POST['submit'])){
        $userCreated = createUser();
    }

    if ($userCreated) { ?>

        Here goes your message about successfull user creation, or you can use echo '' and you can skip PHP open close tag

    <?php } else { ?>
        <div class="row justify-content-md-center">
            <form action="register.php" method="post">
                ...
            </form>
        </div>
    <?php } 
?>


下面是您关于成功创建用户的消息，或者您可以使用echo“”，也可以跳过PHP open-close标记
...

这样，您就不需要使用全局函数，而是使用createUser函数的返回值，它告诉您该函数是否成功
 可以通过删除
$welcome
变量和
else
来进一步优化，只需在末尾直接返回字符串。@Vasyl Zhuryk Yea有效，我尝试了类似的方法，但不起作用，如果我在
if
中返回它，则会有任何不同$结果
或
$result
你可以用不同的方式来做）我只是提供了一个简短的条件）