PHP
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发表于 5年以前
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接着上篇继续学习： [《php实现购物车的功能（上）》](http://www.jb51.net/article/77526.htm)
7、实现一个管理界面
登录界面
由以下代码实现：
7.1 admin.php
<?php
/**
* @author switch
* @copyright 2015
* 主管理菜单
*/
//require_once语句和require语句完全相同,唯一区别是PHP会检查该文件是否已经被包含过,如果是则不会再次包含。
require_once('book_sc_fns.php');
session_start();
if((@$_POST['username']) && (@$_POST['passwd'])) //尝试登陆
{
$username = $_POST['username'];
$passwd = $_POST['passwd'];
if(login($username,$passwd))
{
$_SESSION['admin_user'] = $username;
}
else
{
do_html_header("Problem:");
echo "<p>You could not be logged in.<br />
You must be logged in to view this page.</p>";
do_html_URL('login.php','Login');
do_html_footer();
exit;
}
}
do_html_header("Administration");
if(check_admin_user())
{
display_admin_menu();
}
else
{
echo "<p>You are not authorized to enter the administration area.</p>";
do_html_URL('login.php','Login');
}
do_html_footer();
?>
7.2 user_auth_fns.php文件中的函数login()
function login($username,$password) //登录
{
$conn = db_connect(); //连接数据库
if(!$conn)
return 0;
//检查用户名唯一性
$query = "select * from admin where username='". $username ."'
and password = sha1('". $password ."')";
$result = $conn ->query($query);
if(!$result)
return 0;
if($result ->num_rows > 0)
return 1;
else
return 0;
}
7.3 user_auth_fns.php文件中的函数check_admin_user()
function check_admin_user() //检查是否是管理员
{
if(isset($_SESSION['admin_user']))
return true;
else
return false;
}
管理主界面
由以下代码实现：
7.4 output_fns.php文件中的函数display_admin_menu()
function display_admin_menu() //输出管理员菜单
{
?>
<br />
<a href="index.php">Go to main site</a><br />
<a href="insert_category_form.php">Add a new category</a><br />
<a href="insert_book_form.php">Add a new book</a><br />
<a href="change_password_form.php">Change admin password</a><br />
<?php
}
function display_button($target,$image,$alt) //显示按钮
{
echo "<div align= \" center \"><a href=\"". $target ."\">
<img src=\"images/". $image .".gif\"
alt=\"". $alt ."\" border = \" 0 \" height = \" 50 \"
width = \" 135 \" /></a></div>";
}
目录添加
目录添加成功
目录页中可以看出多了Novel目录
由以下代码实现：
7.5 insert_category_form.php
<?php
/**
* @author switch
* @copyright 2015
* 允许管理员向数据库中添加一个目录的表格
*/
//require_once语句和require语句完全相同,唯一区别是PHP会检查该文件是否已经被包含过,如果是则不会再次包含
require_once('book_sc_fns.php');
session_start();
do_html_header();
if(check_admin_user())
{
display_category_form();
do_html_URL("admin.php","Back to administrtion menu");
}
else
{
echo "<p>You are not authorized to enter the administation area.</p>";
}
do_html_footer();
?>
7.6 insert_category.php
<?php
/**
* @author switch
* @copyright 2015
* 向数据库中插入新目录
*/
//require_once语句和require语句完全相同,唯一区别是PHP会检查该文件是否已经被包含过,如果是则不会再次包含
require_once('book_sc_fns.php');
session_start();
do_html_header("Adding a category");
if(check_admin_user())
{
if(filled_out($_POST))
{
$catname =$_POST['catname'];
if(insert_category($catname))
{
echo "<p>Category \"". $catname ."\" was added to the database.</p>";
}
else
{
echo "<p>Category \"". $catname ."\" could not be added to the database.</p>";
}
}
else
{
echo "<p>You have not filled out the form. Please try again.</p>";
}
do_html_URL("admin.php","Back to administration menu");
}
else
{
echo "<p>You are not authorised to view this page.</p>";
}
do_html_footer();
?>
管理员目录界面
目录编辑界面-可更新，删除
目录更新成功
目录主界面可以看到该目录更改成功
由以下代码实现：
7.7 edit_category_form.php
<?php
/**
* @author switch
* @copyright 2015
* 管理员编辑目录的表单
*/
//require_once语句和require语句完全相同,唯一区别是PHP会检查该文件是否已经被包含过,如果是则不会再次包含。
require_once('book_sc_fns.php');
session_start();
do_html_header("Edit category");
if(check_admin_user())
{
if($catname = get_category_name($_GET['catid']))
{
$catid = $_GET['catid'];
$cat = compact('catname','catid');
display_category_form($cat);
}
else
{
echo "<p>Could not retrieve category details.</p>";
}
do_html_URL("admin.php","Back to administration menu");
}
else
{
echo "<p>You are not authorized to enter the administration area.</p>";
}
do_html_footer();
?>
7.8 edit_category.php
<?php
/**
* @author switch
* @copyright 2015
* 更新数据库中的目录
*/
//require_once语句和require语句完全相同,唯一区别是PHP会检查该文件是否已经被包含过,如果是则不会再次包含。
require_once('book_sc_fns.php');
session_start();
do_html_header("Updating category");
if(check_admin_user())
{
if(filled_out($_POST))
{
if(update_category($_POST['catid'],$_POST['catname']))
{
echo "<p>Category was updated.</p>";
}
else
{
echo "<p>Category could not be updated.</p>";
}
}
else
{
echo "<p>you have not filled out the form. Please try again.</p>";
}
do_html_URL("admin.php","Back to administration menu");
}
else
{
echo "<p>You are not authorised to view this page.</p>";
}
do_html_footer();
?>
7.9 admin_fns.php
<?php
/**
* @author switch
* @copyright 2015
* 管理脚本使用的函数集合
*/
function display_category_form($category = '') //显示目录表单
{
//如果传入存在目录，进入编辑模式
$edit = is_array($category);
?>
<form method="post" action="<?php echo $edit ? 'edit_category.php' :'insert_category.php'; ?>">
<table border="0">
<tr>
<td>Category Name:</td>
<td><input type="text" name="catname" size="40" maxlength="40" value="<?php echo $edit ? $category['catname'] : ''; ?>"/></td>
</tr>
<tr>
<td <?php if(!$edit){echo "colspan=2";} ?> align="center">
<?php
if($edit)
{
echo "<input type=\"hidden\" name=\"catid\" value=\"". $category['catid'] ."\" />";
}
?>
<input type="submit" value="<?php echo $edit ? 'Update' : 'Add'; ?> Category"/></form>
</td>
<?php
if($edit) //允许删除存在目录
{
echo "<td>
<form method=\"post\" action=\"delete_category.php\">
<input type=\"hidden\" name=\"catid\" value=\"". $category['catid'] ."\" />
<input type=\"submit\" value=\"Delete category\" />
</form></td>";
}
?>
</tr>
</table>
<?php
}
function display_book_form($book = '') //显示图书表单
{
//如果传入图书存在，进入编辑模式
$edit = is_array($book);
?>
<form method="post" action="<?php echo $edit ? 'edit_book.php' : 'insert_book.php'; ?>">
<table border="0">
<tr>
<td>ISBN:</td>
<td><input type="text" name="isbn" value="<?php echo $edit ? $book['isbn'] : ''; ?>" /></td>
</tr>
<tr>
<td>Book Title:</td>
<td><input type="text" name="title" value="<?php echo $edit ? $book['title'] : ''; ?>" /></td>
</tr>
<tr>
<td>Book Author:</td>
<td><input type="text" name="author" value="<?php echo $edit ? $book['author'] : ''; ?>"/></td>
</tr>
<tr>
<td>Category:</td>
<td>
<select name="catid">
<?php
$cat_array = get_categories();
foreach($cat_array as $thiscat)
{
echo "<option value=\"". $thiscat['catid'] ."\"";
if(($edit) && ($thiscat['catid'] == $book['catid']))
{
echo " selected";
}
echo ">". $thiscat['catname'] ."</option>";
}
?>
</select>
</td>
</tr>
<tr>
<td>Price:</td>
<td><input type="text" name="price" value="<?php echo $edit ? $book['price'] : ''; ?>" /></td>
</tr>
<tr>
<td>Description:</td>
<td><textarea rows="3" cols="50" name="description"><?php echo $edit ? $book['description'] : ''; ?></textarea></td>
</tr>
<tr>
<td <?php if (!$edit) { echo "colspan=2"; }?> align="center">
<?php
if ($edit)
echo "<input type=\"hidden\" name=\"oldisbn\" value=\"".$book['isbn']."\" />";?>
<input type="submit" value="<?php echo $edit ? 'Update' : 'Add'; ?> Book" /></form></td>
<?php
if ($edit)
{
echo "<td>
<form method=\"post\" action=\"delete_book.php\">
<input type=\"hidden\" name=\"isbn\" value=\"".$book['isbn']."\" />
<input type=\"submit\" value=\"Delete book\"/>
</form></td>";
}
?>
</td>
</tr>
</table>
</form>
<?php
}
function display_password_form() //显示更改密码表单
{
?>
<br />
<form action="change_password.php" method="post">
<table width="250" cellpadding="2" cellspacing="0" bgcolor="#cccccc">
<tr>
<td>Old password:</td>
<td><input type="password" name="old_passwd" size="16" maxlength="16"/></td>
</tr>
<tr>
<td>New password:</td>
<td><input type="password" name="new_passwd" size="16" maxlength="16"/></td>
</tr>
<tr>
<td>Repeat new password:</td>
<td><input type="password" name="new_passwd2" size="16" maxlength="16"/></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value="Change password"/></td>
</tr>
</table>
</form>
<br />
<?php
}
function insert_category($catname) //目录插入
{
$conn = db_connect(); //数据库连接
$query = "select *
from categories
where catname='". $catname ."'";
$result = $conn ->query($query);
if((!$result) || ($result ->num_rows != 0))
return false;
$query = "insert into categories values
('','". $catname ."')";
$result = $conn ->query($query);
if(!$result)
return false;
else
return true;
}
function insert_book($isbn,$title,$author,$catid,$price,$description) //图书插入
{
$conn = db_connect(); //连接数据库
$query = "select * from books
where isbn='". $isbn ."'";
$result = $conn ->query($query);
if((!$result) || ($result ->num_rows != 0))
return false;
$query = "insert into books values
('". $isbn ."','". $author ."','". $title ."',
'". $catid ."','". $price ."','". $description ."')";
$result = $conn ->query($query);
if(!$result)
return false;
else
return true;
}
function update_category($catid,$catname) //更改目录名称
{
$conn = db_connect(); //连接数据库
$query = "update categories
set catname='". $catname ."'
where catid='". $catid ."'";
$result = @$conn ->query($query);
if(!$result)
return false;
else
return true;
}
function update_book($oldisbn,$isbn,$title,$author,$catid,$price,$description)
{
$conn = db_connect(); //连接数据库
$query = "update books
set isbn='". $isbn ."',
title='". $title ."',
author='". $author ."',
catid='". $catid ."',
price ='". $price ."',
description='". $description ."'
where isbn='". $oldisbn ."'";
$result = @$conn ->query($query);
if(!$result)
return false;
else
return true;
}
function delete_category($catid) //删除目录
{
$conn = db_connect(); //连接数据库
$query = "select *
from books
where catid='". $catid ."'";
$result = @$conn ->query($query);
if((!$result) || (@$result ->num_rows > 0)) //如果该目录有图书，无法删除该目录
return false;
$query = "delete from categories
where catid='". $catid ."'";
$result = @$conn ->query($query);
if(!$result)
return false;
else
return true;
}
function delete_book($isbn) //删除图书
{
$conn = db_connect(); //连接数据库
$query = "delete from books
where isbn='". $isbn ."'";
$result = @$conn ->query($query);
if(!$result)
return false;
else
return true;
}
?>7.10 目录删除操作，图书添加，更新，删除操作基本与上述操作差不多，这里就不在演示，可以下载代码查看
8、扩展
本项目创建了一个相当简单的PHP购物车系统。我们还可以对它进行许多改进和提高：
以上就是php实现购物车功能的全部代码，希望对大家的学习有所帮助。
源码下载：[购物车](http://xiazai.jb51.net/201512/yuanma/shopping cart(jb51.net).rar)