我不知道如何处理这个错误。我尝试定义对象，但它仍然给出相同的错误。请建议我应该怎么做。
这是我的代码。我已经编辑了它，现在我收到错误消息
错误！
<?php
include("db_connect.php");
$mysqli = new mysqli("localhost", "netelmbn", "sh00tingstar", "netelmbn_ecom");
if ($mysqli->connect_errno) {
printf("Connect failed: %s\n", $mysqli->connect_error);
exit();
}
function renderForm($ProductName = '', $Description ='', $Price ='', $Size ='', $error = '', $ProductID = '')
{ ?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>
<?php if ($ProductID != '') { echo "Edit Record"; } else { echo "New Record"; } ?>
</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
</head>
<body>
<h1><?php if ($ProductID != '') { echo "Edit Record"; } else { echo "New Record"; } ?></h1>
<?php if ($error != '') {
echo "<div style='padding:4px; border:1px solid red; color:red'>" . $error
. "</div>";
} ?>
<form action="" method="post">
<div>
<?php if ($ProductID != '') { ?>
<input type="hidden" name="id" value="<?php echo $ProductID; ?>" />
<p>ID: <?php echo $id; ?></p>
<?php } ?>
<strong>Product Name: *</strong> <input type="text" name="ProductName"
value="<?php echo $ProductName; ?>"/><br/>
<strong>Description: *</strong> <input type="text" name="Description"
value="<?php echo $Description; ?>"/>
<strong>Price: *</strong> <input type="text" name="Price"
value="<?php echo $Price; ?>"/>
<strong>Size: *</strong> <input type="text" name="Size"
value="<?php echo $Size; ?>"/>
<p>* required</p>
<input type="submit" name="submit" value="Submit" />
</div>
</form>
</body>
</html>
<?php }
/*
EDIT RECORD
*/
if (isset($_GET['ProductID']))
{
if (isset($_POST['submit']))
{
if (is_numeric($_POST['ProductID']))
{
$ProductID = $_POST['ProductID'];
$ProductName = htmlentities($_POST['ProductName'], ENT_QUOTES);
$Description = htmlentities($_POST['Description'], ENT_QUOTES);
$Price = htmlentities($_POST['Price'], ENT_QUOTES);
$Size = htmlentities($_POST['Size'], ENT_QUOTES);
if ($ProductName == '' || $Description == '' || $Price =='' || $Size =='')
{
// if they are empty, show an error message and display the form
$error = 'ERROR: Please fill in all required fields!';
renderForm($ProductName, $Description, $Price, $Size, $error, $ProductID);
}
else
{
if ($stmt = $mysqli->prepare("UPDATE Products SET ProductName = ?, Description = ?, Price = ?, Size = ?
WHERE id=?"))
{
$stmt->bind_param("ssi", $Productname, $Description, $Price, $Size, $ProductID);
$stmt->execute();
$stmt->close();
}
else
{
echo "ERROR: could not prepare SQL statement.";
}
header("Location: view.php");
}
}
else
{
**echo "Error!";**
}
}
else
{
if (is_numeric($_GET['ProductID']) && $_GET['ProductID'] > 0)
{
$id = $_GET['ProductID'];
if($stmt = $mysqli->prepare("SELECT * FROM Products WHERE id=?"))
{
$stmt->bind_param("i", $id);
$stmt->execute();
$stmt->bind_result($id, $ProductName, $Description, $Price, $Size);
$stmt->fetch();
renderForm($ProductName, $Description, $Price, $Size, NULL, $id);
$stmt->close();
}
else
{
echo "Error: could not prepare SQL statement";
}
}
else
{
header("Location: view.php");
}
}
}
/*
NEW RECORD
*/
else
{
if (isset($_POST['submit']))
{
// get the form data
$ProductName = htmlentities($_POST['ProductName'], ENT_QUOTES);
$Description = htmlentities($_POST['Description'], ENT_QUOTES);
$Price = htmlentities($_POST['Price'], ENT_QUOTES);
$Size = htmlentities($_POST['Size'], ENT_QUOTES);
if ($ProductName == '' || $Description == '' || Price =='' || Size =='')
{
$error = 'ERROR: Please fill in all required fields!';
renderForm($ProductName, $Description, $Price, $Size, $error);
}
else
{
if ($stmt = $mysqli->prepare("INSERT Products (ProductName, Description, Price, Size) VALUES (?, ?, ?, ?)"))
{
$stmt->bind_param("ss", $ProductName, $Description, $Price, $Size);
$stmt->execute();
$stmt->close();
}
// show an error if the query has an error
else
{
echo "ERROR: Could not prepare SQL statement.";
}
// redirec the user
header("Location: view.php");
}
}
else
{
renderForm();
}
}
?>