Php 如何将注释保存到数据库中的名称为；匿名；？

留言簿有以下PHP代码：

<?php require_once('config.php');

if(!empty($_POST['comment'])) {
    $stmt = $dbConn->prepare('INSERT INTO comments(`author`, `comment`) VALUES(:author, :comment)');
    $stmt->execute(array('author' => $_POST['author'], 'comment' => $_POST['comment']));
    header("location: /index.php");
}

$stmt = $dbConn->prepare('SELECT author, comment, created_at FROM comments ORDER BY id DESC');
$stmt->execute();
$comments = $stmt->fetchAll();
;?>

<title>Comments Page</title>
<link rel='stylesheet' href='style.css'>

<div id='comments-header'>
    <h1></h1>
</div>
<div id='comments-form'>
    <h3>Please add your comment</h3>
    <form method='post'>
        <div>
            <div>
                <input type="text" name="author" placeholder="Enter your name">
            </div>
            <div>
                <textarea name='comment' placeholder="Enter your comment"></textarea>
            </div>
            <div>
                <br>
                <input type='submit' name='submit' value='Save'>
            </div>
        </div>
    </form>
</div>
<div id='comments-panel'>
    <h3>Comments:</h3>
    <?php foreach ($comments as $comment): ?>
        <p><?=$comment['comment']?>
            <span class='comment-date comment-author'>
                (<?=$comment['author']?> <?=$comment['created_at'];?>)
            </span>
        </p>
    <?php endforeach; ?>
</div>

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评论：

( )

代码差不多准备好了，但我有一个问题

根据问题说明，如果用户没有指明他的名字，我们需要将他的评论以“匿名”的名义保存到数据库中。如何实施？ 提前谢谢。

使用if

if (!empty($_POST["author"]))
    $author = $_POST["author"]);
else
    $author = "Anon";

或三元表达式，其将提供相同的：

$author = ((!empty($_POST["author"])) ? ($_POST["author"]) : ("Anon"));

$author = ((!empty($_POST["author"])) ?? ("Anon"));

如果您使用的是php 7，您可以使用它，它提供了相同的功能：

$author = ((!empty($_POST["author"])) ? ($_POST["author"]) : ("Anon"));

$author = ((!empty($_POST["author"])) ?? ("Anon"));

然后在参数中：

$stmt->execute（数组（'author'=>$author…

---

请注意，您不需要在三元表达式的每个元素周围都用括号括起来。这是我的老习惯。

只需检查作者是否已在POST数组中设置，如果未设置，则使用三元运算符将其设置为默认值，并更改执行参数数组中的变量即可

<?php require_once('config.php');

$auth = isset($_POST['author']) ? $_POST['author'] : 'ANON';

if(!empty($_POST['comment'])) {
    $stmt = $dbConn->prepare('INSERT INTO comments(`author`, `comment`) VALUES(:author, :comment)');
    $stmt->execute(array('author' => $auth, 'comment' => $_POST['comment']));
    // changed                       ^^^^^
    header("location: /index.php");
}

$stmt = $dbConn->prepare('SELECT author, comment, created_at FROM comments ORDER BY id DESC');
$stmt->execute();
$comments = $stmt->fetchAll();
;?>

<title>Comments Page</title>
<link rel='stylesheet' href='style.css'>

<div id='comments-header'>
    <h1></h1>
</div>
<div id='comments-form'>
    <h3>Please add your comment</h3>
    <form method='post'>
        <div>
            <div>
                <input type="text" name="author" placeholder="Enter your name">
            </div>
            <div>
                <textarea name='comment' placeholder="Enter your comment"></textarea>
            </div>
            <div>
                <br>
                <input type='submit' name='submit' value='Save'>
            </div>
        </div>
    </form>
</div>
<div id='comments-panel'>
    <h3>Comments:</h3>
    <?php foreach ($comments as $comment): ?>
        <p><?=$comment['comment']?>
            <span class='comment-date comment-author'>
                (<?=$comment['author']?> <?=$comment['created_at'];?>)
            </span>
        </p>
    <?php endforeach; ?>
</div>

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请添加您的评论


评论：

( )

测试用户值是否为空，如果为空，则将其替换为匿名。非常简单

$author=！empty（$\u POST['author']）？$\u POST['author']：“匿名”；

@splash58缺少h@JulesR是的！Thx:）