如何在php中使用bootstrap发生错误时显示错误

Question

我正在使用 php 和 bootstrap 构建一个联系表单，我想在发生错误时显示 bootstrap 警报。所以我现在的问题是我已经让代码工作并且它检查错误但是在错误发生之前显示错误警报对话框我试图将错误对话框移到 HTML 下方，但我仍然遇到相同的错误$email = $name = $subject = $message = '';$errors = ['email' => '', 'name' => '', 'subject' => '', 'message' => ''];if (isset($_POST['submit'])) {    // check email    if (empty($_POST['email'])) {        $errors['email'] = "An email is required !";    } else {        $email = $_POST['email'];        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {            $errors['email'] = "Enter a validemail address !";        }    } <div class="form-group">    <label for="email" class="bmd-label-floating">Email address</label>    <input type="email" class="form-control" name="email" value="<?php htmlspecialchars($email)?>">    <div class="mt-2 alert alert-warning alert-dismissible fade show" role="alert">        <?php echo $errors['email'] ?>    </div></div>预期的行为应该是在错误发生时在错误对话框中显示错误，而不是在错误发生之前出现错误对话框

Answer 1

您想用 an 包装模态if以检查是否确实存在错误。

<?php if($errors['email']): ?>

<div class="mt-2 alert alert-warning alert-dismissible fade show" role="alert">

    <?php echo $errors['email'] ?>

</div>

<?php endif; ?>

Answer 2

在显示错误之前添加检查。喜欢下面

<?php

if(isset($errors['email']) && $errors['email']!=''){ 

?>

<div class="mt-2 alert alert-warning alert-dismissible fade show" role="alert">

        <?php echo $errors['email']; ?>

</div>

<?php } ?>