所以我设法摆脱了所有未定义的错误并排除了问题，但是当我从我的数据库页面转到我的编辑页面以便它发布ID没有数据出现然后即使发布编辑也没有发生在数据库。我检查了php错误日志和mysql日志，没有任何东西也尝试了一些PHP调试，但也没有从那里得到数据，我没有一些错误代码来看看我的想法。
<?php
/*
EDIT.PHP
Allows user to edit specific entry in database
Status: Not working at all
*/
// creates the edit record form
// since this form is used multiple times in this file, I have made it a function that is easily reusable
function renderForm($id, $date, $user, $model, $serial, $issue)
{
?>
<!DOCTYPE HTML>
<html>
<head>
<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
<meta content="utf-8" http-equiv="encoding">
<title>Edit Record</title>
</head>
<body>
<?php
// if there are any errors, display them
//if ($error != '')
//{
//echo '<div style="padding:4px; border:1px solid red; color:red;">'.$error.'</div>';
//}
?>
<form action="" method="post">
<input type="hidden" name="id" value="<?php echo $id; ?>"/>
<div>
<p><strong>ID:</strong> <?php echo $id; ?></p>
<strong>Date: *</strong> <input type="text" name="date" value="<?php echo $date; ?>"/><br/>
<strong>User: *</strong> <input type="text" name="user" value="<?php echo $user; ?>"/><br/>
<strong>Model: *</strong> <input type="text" name="model" value="<?php echo $model; ?>"/><br/>
<strong>Serial: *</strong> <input type="text" name="serial" value="<?php echo $serial; ?>"/><br/>
<strong>Issue: *</strong> <input type="text" name="issue" value="<?php echo $issue; ?>"/><br/>
<p>* Required</p>
<input type="submit" name="submit" value="Submit">
</div>
</form>
</body>
</html>
<?php
}
// connect to the database
include('conn.php');
// check if the form has been submitted. If it has, process the form and save it to the database
if (isset($_POST['submit']))
{
// confirm that the 'id' value is a valid integer before getting the form data
if (is_numeric($_POST['id']))
{
// get form data, making sure it is valid
$id = isset($_POST['id']) ? $_POST['id'] : '';
$date = isset($_POST['date']) ? $_POST['date'] : '';
$user = isset($_POST['user']) ? $_POST['user'] : '';
$model = isset($_POST['model']) ? $_POST['model'] : '';
$serial = isset($_POST['serial']) ? $_POST['serial'] : '';
$issue = isset($_POST['issue']) ? $_POST['issue'] : '';
// check that firstname/lastname fields are both filled in
if ($user == '' || $model == '' || $serial == '' || $issue == '')
{
// generate error message
$error = 'ERROR: Please fill in all required fields!';
//error, display form
renderForm($id, $date, $user, $model, $serial, $issue);
}
else
{
// save the data to the database
mysql_query("UPDATE screen SET id='$id', date='$date', model='$model', serial='$serial', user='$user', issue='$issue'")
or die(mysql_error());
// once saved, redirect back to the view page
header("Location: pview_screen.php");
}
}
else
{
// if the 'id' isn't valid, display an error
echo 'Error!';
}
}
else
// if the form hasn't been submitted, get the data from the db and display the form
{
// get the 'id' value from the URL (if it exists), making sure that it is valid (checing that it is numeric/larger than 0)
if (isset($_GET['id']) && is_numeric($_GET['id']) && $_GET['id'] > 0)
{
// query db
$id = $_GET['id'];
$result = mysql_query("SELECT * FROM screen WHERE id=$id")
or die(mysql_error());
$row = mysql_fetch_array($result);
// check that the 'id' matches up with a row in the databse
if($row)
{
// get data from db
$id = isset($_GET['id']) ? $_GET['id'] : '';
$date = isset($_GET['date']) ? $_GET['date'] : '';
$user = isset($_GET['user']) ? $_GET['user'] : '';
$model = isset($_GET['model']) ? $_GET['model'] : '';
$serial = isset($_GET['serial']) ? $_GET['serial'] : '';
$issue = isset($_GET['issue']) ? $_GET['issue'] : '';
// show form
renderForm($id, $date, $model, $serial, $user, $issue);
}
else
// if no match, display result
{
echo "No results!";
}
}
else
// if the 'id' in the URL isn't valid, or if there is no 'id' value, display an error
{
echo 'Error!';
}
}
?>