接着上篇继续学习： 《php实现购物车的功能（上）》
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
