我正忙着研究一本关于php的书，他们正在练习从数据库中删除记录。我遇到的问题是删除与数据库条目关联的图像。我有一个定义的常量：
define(GW_UPLOADPATH, 'images/')
在名为appvars.php的文件中。这是remove.php
<?php
require_once 'authorize.php';
?>
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<?php
require_once 'appvars.php';
require_once 'connectionvars.php';
if(isset($_GET['id']) && isset($_GET['name']) && isset($_GET['score']) && isset($_GET['date'])
&& isset($_GET['screenshot'])){
$id = $_GET['id'];
$name = $_GET['name'];
$score = $_GET['score'];
$date = $_GET['date'];
$screenshot = $_GET['screenshot'];
} else if(isset($_POST['id']) && isset($_POST['name']) && isset($_POST['score']) && isset($_POST['date'])){
$id = $_POST['id'];
$name = $_POST['name'];
$score = $_POST['score'];
$date = $_POST['date'];
} else {
echo 'No record selected';
}
if(isset($_POST['submit'])){
if(($_POST['confirm'] == 'Yes') && is_file(GW_UPLOADPATH.$screenshot)){
unlink(trim(GW_UPLOADPATH.$screenshot));
$query = "DELETE from guitarwars where id = $id limit 1";
mysqli_query($dbc, $query);
mysqli_close($dbc);
echo '<p class="error">The score of ' . $score . ' for' . $name . ' was successfully deleted</p>';
} else {
echo '<p class="error">Error removing record</p>';
}
}
else if(isset ($id) && isset($name) && isset($date) && isset($score) && isset($screenshot)){
echo '<p>Are you sure you want to delete the following high score?</p>';
echo '<p>Name: ' . $name . '<br />Date: ' . $date . '<br />Score: ' . $score . '<br />'
. 'PATH:' . GW_UPLOADPATH.$screenshot. '</p>' ;
echo '<form method="POST" action="remove.php">';
echo '<input type="radio" name="confirm" value="Yes" />Yes<br />';
echo '<input type="radio" name="confirm" value="No" checked="checked" />No<br />';
echo '<input type="submit" name="submit" value="Submit">';
echo '<input type="hidden" name="id" value="' . $id . '">';
echo '<input type="hidden" name="name" value="' . $name . '">';
echo '<input type="hidden" name="date" value="' . $date . '">';
echo '<input type="hidden" name="score" value="' . $score . '">';
echo '</form>';
}
echo '<p><a href="admin.php">Back to Admin page</a></p>';
?>
</body>
</html>
数据库删除条目100％，但我得到一个错误，即图像是目录。如果您查看html，它会将路径报告为images / imageName.gif
我添加了is_file（）以试图弄清楚发生了什么，结果我现在得到了我分配的错误消息“Error removal record”。所以我认为，它没有看到我的imageName.gif作为文件。不确定如何删除该文件，该书和平使用取消链接。
非常感谢任何指导
ADDED：addscore.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Guitar Wars - Add Your High Score</title>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>
<h2>Guitar Wars - Add Your High Score</h2>
<?php
require_once 'appvars.php';
require_once 'connectionvars.php';
if (isset($_POST['submit'])) {
// Grab the score data from the POST
$name = $_POST['name'];
$score = $_POST['score'];
$screenshot = $_FILES['screenshot']['name'];
$screenshot_type = $_FILES['screenshot']['type'];
$screenshot_size = $_FILES['screenshot']['size'];
if (!empty($name) && !empty($score) && !empty($screenshot)) {
if((($screenshot_type == 'image/gif') || ($screenshot_type == 'image/jpeg') || ($screenshot_type == 'image/pjpeg')
|| ($screenshot_type == 'image/png')) && (($screenshot_size > 0) && ($screenshot_size <= GW_MAXUPLOADSIZE))){
$target = GW_UPLOADPATH.$screenshot;
if(move_uploaded_file($_FILES['screenshot']['tmp_name'], $target)){
// Write the data to the database
$query = "INSERT INTO guitarwars VALUES (0, NOW(), '$name', '$score', '$screenshot')";
mysqli_query($dbc, $query) or die('Error inserting data: ' . mysqli_error($dbc));
// Confirm success with the user
echo '<p>Thanks for adding your new high score!</p>';
echo '<p><strong>Name:</strong> ' . $name . '<br />';
echo '<strong>Score:</strong> ' . $score . '<br />';
echo '<img src="' . GW_UPLOADPATH.$screenshot . '" alt="screenshot image" /></p>';
echo '<p><a href="index.php"><< Back to high scores</a></p>';
// Clear the score data to clear the form
$name = "";
$score = "";
mysqli_close($dbc);
}
} else {
echo '<p class="error">Please ensure image file is corrent format and less than ' . (GW_MAXUPLOADSIZE / 1024) .
'Kb</p>';
}
@unlink($_FILES['screenshot']['tmp_name']);
}
else {
echo '<p class="error">Please enter all of the information to add your high score.</p>';
}
}
?>
<hr />
<form enctype="multipart/form-data" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<input type="hidden" name="MAX_FILE_SIZE" value="32768"/>
<label for="name">Name:</label>
<input type="text" id="name" name="name" value="<?php if (!empty($name)) echo $name; ?>" /><br />
<label for="score">Score:</label>
<input type="text" id="score" name="score" value="<?php if (!empty($score)) echo $score; ?>" /><br />
<label for="screenshot">Screen Shot:</label>
<input type="file" id="screenshot" name="screenshot" />
<hr />
<input type="submit" value="Add" name="submit" />
</form>
</body>
</html>
答案 0 :(得分：1)
我认为问题是$screenshot未定义......
稍微简化代码，你有：
if(isset($_GET['screenshot'])) {
$screenshot = $_GET['screenshot'];
} else if(isset($POST['id')) {
}
if(isset($_POST['submit'])){
if(($_POST['confirm'] == 'Yes') && is_file(GW_UPLOADPATH.$screenshot)){
所以......假设您没有做一些非常奇怪的事情，请求将是GET请求或POST请求。如果它是GET请求，您只需设置$screenshot，但仅在POST请求中检查is_file。所以你正在检查is_file("images/")并且（正确地）告诉你它是一个目录。
试试这个：
else if(isset($_POST['id']) && isset($_POST['name']) && isset($_POST['score']) && isset($_POST['date']) && isset($_POST['screenshot'])){
$id = $_POST['id'];
$name = $_POST['name'];
$score = $_POST['score'];
$date = $_POST['date'];
$screenshot = $_POST['screenshot']; //<-- add this line
}
...
echo '<form method="POST" action="remove.php">';
echo '<input type="radio" name="confirm" value="Yes" />Yes<br />';
echo '<input type="radio" name="confirm" value="No" checked="checked" />No<br />';
echo '<input type="hidden" name="screenshot" value="$screenshot" />'; //<-- add this line