我在将表单发送到数据库时遇到问题。我目前正在学习初级课程，但是运行它的人遗漏了一些内容并且似乎没有回答问题。我的网站连接到数据库很好，我可以调用内容到网站。我也尝试在设置提交按钮后回显页面输入到页面，这样可行，所以我认为它与我的SQL有关吗？插入和数据库头的所有标题都完全相同。任何帮助，将不胜感激！代码如下：
<!DOCTYPE html>
<html>
<head>
<title>New Form</title>
<script src="js/jquery.js"></script>
<script src="bootstrap/js/bootstrap.js"></script>
<link rel="stylesheet" href="bootstrap/css/bootstrap.css">
<style>
.my-fixed { resize: none;
}
</style>
</head>
<body>
<div class="container">
<h1>Submit Form</h1>
<form class="form-horizontal" action="form_process.php" method="POST" role="form">
<div class="form-group">
<label for="name" class="control-label col-sm-2">Name *</label>
<div class="col-sm-5">
<input type="text" id="name" name="name" class="form-control" placeholder="Full Name" required />
</div>
</div>
<div class="form-group">
<label for="email" class="control-label col-sm-2">Email *</label>
<div class="col-sm-5">
<input type="email" id="email" name="email" class="form-control" placeholder="Email Address" required />
</div>
</div>
<div class="form-group">
<label for="subject" class="control-label col-sm-2">Subject *</label>
<div class="col-sm-5">
<input type="text" id="subject" name="subject" class="form-control" placeholder="Add a Subject" required />
</div>
</div>
<div class="form-group">
<label for="gender" class="control-label col-sm-2">Gender</label>
<div class="col-sm-2">
<select class="form-control" name="gender">
<option value="">Select gender</option>
<option value="male">Male</option>
<option value="female">Female</option>
</select>
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-2">Skills</label>
<div class="col-sm-5">
<label class="checkbox-inline" for="skill1"><input type="checkbox" name="skill1">HTML</label>
<label class="checkbox-inline" for="skill2"><input type="checkbox" name="skill2">PHP</label>
<label class="checkbox-inline" for="skill3"><input type="checkbox" name="skill3">CSS</label>
<label class="checkbox-inline" for="skill4"><input type="checkbox" name="skill4">JavaScript</label>
</div>
</div>
<div class="form-group">
<label for="country" class="control-label col-sm-2">Country</label>
<div class="col-sm-2">
<select class="form-control" name="country">
<option value="">Select country</option>
<option value="ireland">Ireland</option>
<option value="uk">UK</option>
<option value="france">France</option>
<option value="usa">USA</option>
</select>
</div>
</div>
<div class="form-group">
<label for="comments" class="control-label col-sm-2">Comments *</label>
<div class="col-sm-5">
<textarea class="form-control my-fixed" name="comments" id="comments" rows="8" required></textarea>
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-2"></label>
<div class="col-sm-5">
<input type="submit" class="btn btn-default btn-block" name="submit_form" value="Submit form">
</div>
</div>
</form>
</div>
</body>
</html>
这就是它的所在：
<?php
session_start();
include 'includes/db.php';
if (isset($_POST['submit_form'])) {
$name = strip_tags($_POST['name']);
$email = strip_tags($_POST['email']);
$subject = htmlspecialchars($_POST['subject']);
$gender = $_POST['gender'];
$country = $_POST['country'];
$comments = trim(htmlspecialchars($_POST['comments']));
if(empty($_POST['skill1'])){
$_POST['skill1'] = '';
}
if(empty($_POST['skill2'])){
$_POST['skill2'] = '';
}
if(empty($_POST['skill3'])){
$_POST['skill3'] = '';
}
if(empty($_POST['skill4'])){
$_POST['skill4'] = '';
}
$ins_sql = "INSERT INTO comments (name, email_address, subject, gender, skill1, skill2, skill3, skill4, country, comments) VALUES ('$name', '$email', '$subject', '$gender', '$_POST[skill1]', '$_POST[skill2]', '$_POST[skill3]', '$_POST[skill4]', $country, $comments )";
$run_sql = mysqli_query($conn, $ins_sql);
echo 'Thank You!';
echo $name, $email, $subject, $gender, $_POST['skill1'], $_POST['skill2'], $_POST['skill3'], $_POST['skill4'], $country, $comments;
} else {
}
?>