我不知道为了让它发挥作用我需要做些什么。在单击更新按钮后，此页面应更新联系人的信息。它将id号输入页面，它从数据库中读取信息并将其作为值放入输入中。然后根据需要更新输入，并将其更新到服务器。但由于某种原因，它没有执行Update语句，也没有任何变化。它还应该能够上传图像并使其成为更新的一部分。
<?php
session_start();
$_SESSION['message'] = '<div class="message">Your contact has been updated</div>';
$dbh = new PDO('mysql:host=localhost;dbname=ssl;port=8889', 'root', 'root');
$contactid = $_GET['id'];
$stmt=$dbh->prepare("SELECT * FROM contacts where contactid = :contactid");
$stmt->bindParam(':contactid', $contactid);
$stmt->execute();
$result = $stmt->fetchAll();
if (isset($_POST['submit'])) {
$firstname = $_POST['firstname'];
$lastname = $_POST['lastname'];
$phone = $_POST['phone'];
$email = $_POST['email'];
$address = $_POST['address'];
$city = $_POST['city'];
$state = $_POST['state'];
$target_file = "uploads/" . basename($_FILES['picture']['name']);
$picture = $_FILES['picture']['name'];
if (move_uploaded_file($_FILES['picture']['tmp_name'], $target_file)) {
echo "<div class='message2'>File Uploaded.</div>";
}
//SQL statement to update data
$stmt=$dbh->prepare("UPDATE contacts SET firstname='" . $firstname . "',
lastname='" . $lastname . "',
phone='" . $phone . "',
email='" . $email . "',
address='" . $address . "',
city='" . $city . "',
state='" . $state . "',
picture='" . $picture . "',
WHERE contactid='" . $contactid . "';");
$stmt->execute();
echo "<div class='message'>Your contact has been added!</div>";
header("location: index.php");
die();
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Update</title>
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<nav>
<h1>Update A Fruit</h1>
</nav>
<form id="form" action="index.php" method="post">
<p>Edit the following:</p> <br />
First Name: <input type="text" name="firstname" value="<?php echo $result[0]['firstname']; ?>" /><br />
Last Name: <input type="text" name="lastname" value="<?php echo $result[0]['lastname']; ?>" /><br />
Phone: <input type="text" name="phone" value="<?php echo $result[0]['phone']; ?>" /><br />
Email: <input type="text" name="email" value="<?php echo $result[0]['email']; ?>" /><br />
Address: <input type="text" name="address" value="<?php echo $result[0]['address']; ?>" /><br />
City: <input type="text" name="city" value="<?php echo $result[0]['city']; ?>" /><br />
State: <select id="state" type="text" name="state" value="">
<option value="" selected>Select a State</option>
<option value="AL">Alabama</option>
<option value="AK">Alaska</option>
<option value="AZ">Arizona</option>
<option value="AR">Arkansas</option>
<option value="CA">California</option>
<option value="CO">Colorado</option>
<option value="CT">Connecticut</option>
<option value="DE">Delaware</option>
<option value="DC">District Of Columbia</option>
<option value="FL">Florida</option>
<option value="GA">Georgia</option>
<option value="HI">Hawaii</option>
<option value="ID">Idaho</option>
<option value="IL">Illinois</option>
<option value="IN">Indiana</option>
<option value="IA">Iowa</option>
<option value="KS">Kansas</option>
<option value="KY">Kentucky</option>
<option value="LA">Louisiana</option>
<option value="ME">Maine</option>
<option value="MD">Maryland</option>
<option value="MA">Massachusetts</option>
<option value="MI">Michigan</option>
<option value="MN">Minnesota</option>
<option value="MS">Mississippi</option>
<option value="MO">Missouri</option>
<option value="MT">Montana</option>
<option value="NE">Nebraska</option>
<option value="NV">Nevada</option>
<option value="NH">New Hampshire</option>
<option value="NJ">New Jersey</option>
<option value="NM">New Mexico</option>
<option value="NY">New York</option>
<option value="NC">North Carolina</option>
<option value="ND">North Dakota</option>
<option value="OH">Ohio</option>
<option value="OK">Oklahoma</option>
<option value="OR">Oregon</option>
<option value="PA">Pennsylvania</option>
<option value="RI">Rhode Island</option>
<option value="SC">South Carolina</option>
<option value="SD">South Dakota</option>
<option value="TN">Tennessee</option>
<option value="TX">Texas</option>
<option value="UT">Utah</option>
<option value="VT">Vermont</option>
<option value="VA">Virginia</option>
<option value="WA">Washington</option>
<option value="WV">West Virginia</option>
<option value="WI">Wisconsin</option>
<option value="WY">Wyoming</option>
</select><br>
<input type="file" name="picture" value="<?php echo $result[0]['picture']; ?>"><br />
<input type="submit" name="submit" value="Update">
</form>
<a href="index.php">Go Back</a>
<pre>
<?php var_dump($st); ?>
</pre>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<script>
$('.message').fadeIn(500).delay(3000).fadeOut(600);
</script>
</body>
</html>
答案 0 :(得分：0)
您需要在代码中更改一些内容，例如：
按以下方式更改action的{{1}}，
<form>除非您在action="index.php?id=<?php echo $contactid; ?>"
中加入enctype="multipart/form-data"，否则您无法上传包含表单的任何文件。
因此，基于以上两个陈述，您的<form>元素将如下所示：
<form>在<form id="form" action="index.php?id=<?php echo $contactid; ?>" method="post" enctype="multipart/form-data">
准备好的陈述中使用占位符。
在UPDATE操作之前执行UPDATE操作 ，否则您将无法在SELECT字段中获取更新值你更新它们。