HTML表单数据怎么获取_PHP接收HTML表单数据的常用方法

<form action="process.php" method="post">
  <label>用户名：<input type="text" name="username" /></label><br>
  <label>邮箱：<input type="email" name="email" /></label><br>
  <button type="submit">提交</button>
</form>

$username = $_POST['username'] ?? '';
$email = $_POST['email'] ?? '';
<p>echo "欢迎，$username！你的邮箱是 $email。";</p>
                    <div class="aritcle_card">
                        <a class="aritcle_card_img" href="/ai/776">
                            <img src="https://img.php.cn/upload/ai_manual/001/503/042/68b6da605540c641.png" alt="Symanto Text Insights">
                        </a>
                        <div class="aritcle_card_info">
                            <a href="/ai/776">Symanto Text Insights</a>
                            <p>基于心理语言学分析的数据分析和用户洞察</p>
                            <div class="">
                                <img src="/static/images/card_xiazai.png" alt="Symanto Text Insights">
                                <span>84</span>
                            </div>
                        </div>
                        <a href="/ai/776" class="aritcle_card_btn">
                            <span>查看详情</span>
                            <img src="/static/images/cardxiayige-3.png" alt="Symanto Text Insights">
                        </a>
                    </div>
                

$username = htmlspecialchars($_POST['username'] ?? '');
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);
<p>if ($email) {
echo "用户名：$username，邮箱已验证。";
} else {
echo "请输入有效的邮箱地址。";
}</p>

<!-- HTML 表单 -->
<input type="checkbox" name="hobbies[]" value="读书" /> 读书
<input type="checkbox" name="hobbies[]" value="运动" /> 运动
<input type="checkbox" name="hobbies[]" value="音乐" /> 音乐

$hobbies = $_POST['hobbies'] ?? [];
foreach ($hobbies as $hobby) {
    echo htmlspecialchars($hobby) . "<br>";
}