如何使用HTML构建在线表单提交的详细步骤

<form action="submit_form.php" method="POST">
  <!-- 表单内容将放在这里 -->
</form>

<label>姓名：</label>
<input type="text" name="username" required>
<p><br><br></p>
                    <div class="aritcle_card">
                        <a class="aritcle_card_img" href="/ai/1548">
                            <img src="https://img.php.cn/upload/ai_manual/000/000/000/175680242019387.jpg" alt="Block Survey">
                        </a>
                        <div class="aritcle_card_info">
                            <a href="/ai/1548">Block Survey</a>
                            <p>BlockSurvey是一个保护隐私和数据安全调查工具，可以让你使用AI来创建调查表单。</p>
                            <div class="">
                                <img src="/static/images/card_xiazai.png" alt="Block Survey">
                                <span>71</span>
                            </div>
                        </div>
                        <a href="/ai/1548" class="aritcle_card_btn">
                            <span>查看详情</span>
                            <img src="/static/images/cardxiayige-3.png" alt="Block Survey">
                        </a>
                    </div>
                <p><label>邮箱：</label>
<input type="email" name="email" required></p><p><br><br></p><p><label>密码：</label>
<input type="password" name="password"></p><p><br><br></p><p><label>性别：</label>
<input type="radio" name="gender" value="male"> 男
<input type="radio" name="gender" value="female"> 女</p><p><br><br></p><p><label>兴趣：</label>
<input type="checkbox" name="hobby" value="reading"> 阅读
<input type="checkbox" name="hobby" value="sports"> 运动</p><p><br><br></p><p><label>所在城市：</label>
<select name="city">
<option value="beijing">北京</option>
<option value="shanghai">上海</option>
<option value="guangzhou">广州</option>
</select></p><p><br><br></p><p><label>留言：</label><br>
<textarea name="message" rows="4" cols="50"></textarea></p><p><br><br></p><p><input type="submit" value="提交表单"></p>

<label for="email">邮箱：</label>
<input type="email" id="email" name="email" placeholder="请输入邮箱" required>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  $name = $_POST["username"];
  $email = $_POST["email"];
  echo "感谢提交，$name！我们已收到你的信息。";
}
?>