无法从 PHP 的 HTML 表单中检索值
[英]Cannot retrieve Values from HTML form For PHP
问题描述
好的，所以我需要从表单中检索我的变量并将它们放在插入语句中，以便我可以将它们输入到数据库中。 问题似乎出在我检索它们的位置，就像我以它的工作形式对它们进行硬编码一样，因此数据库或连接没有问题，只有检索价格和 isbn ，如下所示。
<?php session_start();
session_regenerate_id();
($_SESSION['count']) ? $_SESSION['count']++ : $_SESSION['count'] = 1;
?>
<!-- example for PHP 5.0.0 final release -->
<html>
<head>
<title>Session running</title>
</head>
<body>
<h1> Book Details</h1>
<a href="catalog.php?<?php echo( SID ); ?>">Go Back To Inventory</a>
<hr>
PHPSESSID = <?php echo session_id(); ?>
<br>
You have been here <?php echo( $_SESSION['count'] ); ?> times in this session
<hr>
<html>
<head>
<title>Count Visits</title>
</head>
<body>
<h2></h2>
</body>
</html>
<?php require_once("Include/db_connect.php");
if (isset($_REQUEST['button'])) // submit was clicked
{
display_output_page();
}
?>
<?php
$db_link = db_connect("project");
$self = $_SERVER['PHP_SELF'];
if (isset($_REQUEST['submit'])) // submit was clicked
{
display_output_page();
}
?>
<?php
$isbn = $_REQUEST['isbn'];
$price = isset($_REQUEST['price']) ? $_REQUEST['price'] : '';
$quantity = isset($_REQUEST['value']) ? $_REQUEST['value'] : '';
$fields = mysql_list_fields("project", "books");
$num_columns = mysql_num_fields($fields);
$query = "SELECT * FROM books WHERE isbn=".$isbn.";";
$result = mysql_query($query) or die("SQL failed");
echo '<table border="1">';
echo "<tr>";
for ($i = 0; $i < $num_columns; $i++)
{
echo "<th>", mysql_field_name($fields, $i), "</th>";
}
echo "<th> Quantity </th>";
echo "<th> Add </th>";
echo "</tr>";
while ($row = mysql_fetch_assoc($result))
{
echo "<tr>";
echo "<td>".$row['isbn']."</td>";
echo "<td>".$row['title']."</td>";
echo "<td>".$row['author']. "</td>";
echo "<td>".$row['pub']."</td>";
echo "<td>".$row['year']."</td>";
echo "<td>".$row['price']."</td>";
echo "<td><img src='images/".$row['image']."'></td>";
//IN HERE IS THE PROBLEM, RETRIEVING THE isbn and price variables wont work
echo '<form action="" method="POST">
<td><input type = "text" value=1 style="width: 30px;" name = "value"/></td>
<input type="hidden" name="isbn" value="<php echo $isbn ?>">
input type="hidden" name="price" value="<?php echo $price ?>">
<td><input type = "submit" name = "button" value = "Add"></td>
</form>
';
echo "</tr>";
}
echo "</table>";
mysql_free_result($result);
mysql_close($db_link);
?>
<?php
function display_output_page()
{
require_once("Include/db_connect.php");
$db_link = db_connect("project");
//This is where i need to retrieve the isbn and price variables for my SQL insert
$sessionID = session_id();
$isbn = $_REQUEST['isbn'];
$price = $_REQUEST['price'];
$quantity =$_REQUEST['value'];
$db_link = db_connect("project");
$sql2 = "INSERT INTO cart(sessionID,isbn,quantity,price)
VALUES('$sessionID','$isbn','$quantity','$price')";
$result2 = mysql_query($sql2) or die ("<br> Could not execute SQL query");
if($result2)
{
echo "You Have Added The Item To The Cart";
}
mysql_close($db_link);
}
?>
1 个解决方案
解决方案1
0 2014-04-05 10:30:47
您缺少一些基本的语法元素。
<input type="hidden" name="isbn" value="<?php echo $isbn; ?>">
<input type="hidden" name="price" value="<?php echo $price; ?>">
另外我建议你阅读这篇关于基础 PHP HTML 表单处理的内容，因为你的代码中有很多小错误。
如何从一个表单到另一个HTML检索值？
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.