PHP Cookie登录验证技巧讲解_PHP教程-php教程-PHP中文網

一个网站的建设目的就是功能的完整性。其中有一个功能就是用户登录验证的实现。下面我们就向大家详细介绍有关

PHP Cookie登录验证代码示例：

html>
head>
title>Login /title>
meta http-equiv="Content-Type"
content="text/html; charset=gb2312">
/head>
body>
form name="form1" method="post"
action="login.php">
table width="300" border="0" align="center"
cellpadding="2" cellspacing="2">
tr>
td width="150"> div align="right">
用户名： /div> /td>
td width="150"> input type="text"
name="username"> /td>
/tr>
tr>
td> div align="right">密码： /div> /td>
td> input type="password" name="passcode"> /td>
/tr>
tr>
td> div align="right">Cookie保存时间： /div> /td>
td> select name="cookie" id="cookie">
option value="0" selected>浏览器进程 /option>
option value="1">保存1天 /option>
option value="2">保存30天 /option>
option value="3">保存365天 /option>
/select> /td>
/tr>
/table>
p align="center">
input type="submit" name="Submit" value="Submit">
input type="reset" name="Reset" value="Reset">
/p>
/form>
/body>
/html>

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php  </span></span></span></li>
<li><span>@mysql_connect("localhost", "root","1981427")<br> //选择数据库之前需要先连接数据库服务器  </span></li>
<li class="alt"><span>or die("数据库服务器连接失败");  </span></li>
<li><span>@mysql_select_db("test") //选择数据库mydb  </span></li>
<li class="alt"><span>or die("数据库不存在或不可用");  </span></li>
<li><span>//获取用户输入  </span></li>
<li class="alt">
<span>$</span><span class="attribute">username</span><span> = $_POST['username'];  </span>
</li>
<li>
<span>$</span><span class="attribute">passcode</span><span> = $_POST['passcode'];  </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">cookie</span><span> = $_POST['cookie'];  </span>
</li>
<li><span>//执行SQL语句  </span></li>
<li class="alt">
<span>$</span><span class="attribute">query</span><span> = @mysql_query("select username, <br>userflag from users "  </span>
</li>
<li>
<span>."where </span><span class="attribute">username</span><span> = </span><span class="attribute-value">'$username'</span><span> and <br></span><span class="attribute">passcode</span><span> = </span><span class="attribute-value">'$passcode'</span><span>")  </span>
</li>
<li class="alt"><span>or die("SQL语句执行失败");  </span></li>
<li><span>//判断用户是否存在，密码是否正确  </span></li>
<li class="alt">
<span>if($</span><span class="attribute">row</span><span> = </span><span class="attribute-value">mysql_fetch_array</span><span>($query))  </span>
</li>
<li><span>{  </span></li>
<li class="alt"><span>if($row['userflag'] == 1 or $row['userflag'] == 0) <br>//判断用户权限信息是否有效  </span></li>
<li><span>{  </span></li>
<li class="alt"><span>switch($cookie) //根据用户的选择设置cookie保存时间  </span></li>
<li><span>{  </span></li>
<li class="alt"><span>case 0: //保存Cookie为浏览器进程  </span></li>
<li><span>setcookie("username", $row['username']);  </span></li>
<li class="alt"><span>break;  </span></li>
<li><span>case 1: //保存1天  </span></li>
<li class="alt"><span>setcookie("username", $row['username'],<br> time()+24*60*60);  </span></li>
<li><span>break;  </span></li>
<li class="alt"><span>case 2: //保存30天  </span></li>
<li><span>setcookie("username", $row['username'],<br> time()+30*24*60*60);  </span></li>
<li class="alt"><span>break;  </span></li>
<li><span>case 3: //保存365天  </span></li>
<li class="alt"><span>setcookie("username", $row['username'], <br>time()+365*24*60*60);  </span></li>
<li><span>break;  </span></li>
<li class="alt"><span>}  </span></li>
<li><span>header("location: main.php"); <br>//自动跳转到main.php  </span></li>
<li class="alt"><span>}  </span></li>
<li><span>else  </span></li>
<li class="alt"><span>{  </span></li>
<li><span>echo "用户权限信息不正确";  </span></li>
<li class="alt"><span>}  </span></li>
<li><span>}  </span></li>
<li class="alt"><span>else  </span></li>
<li><span>{  </span></li>
<li class="alt"><span>echo "用户名或密码错误";  </span></li>
<li><span>}  </span></li>
<li class="alt">
<span class="tag">?></span><span> </span>
</li>
</ol>

登入後複製

PHP Cookie登录验证代码实例：

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php  </span></span></span></li>
<li><span>session_start();  </span></li>
<li class="alt"><span>if(isset($_COOKIE['username']))  </span></li>
<li><span>{  </span></li>
<li class="alt"><span>@mysql_connect("localhost", "root","1981427") </span></li>
<li class="alt"><span>//选择数据库之前需要先连接数据库服务器  </span></li>
<li><span>or die("数据库服务器连接失败");  </span></li>
<li class="alt"><span>@mysql_select_db("test") //选择数据库mydb  </span></li>
<li><span>or die("数据库不存在或不可用");  </span></li>
<li class="alt"><span>//获取Session  </span></li>
<li>
<span>$</span><span class="attribute">username</span><span> = $_COOKIE['username'];  </span>
</li>
<li class="alt"><span>//执行SQL语句获得userflag的值  </span></li>
<li>
<span>$</span><span class="attribute">query</span><span> = @mysql_query("select <br>userflag from users "  </span>
</li>
<li class="alt">
<span>."where </span><span class="attribute">username</span><span> = </span><span class="attribute-value">'$username'</span><span>")  </span>
</li>
<li><span>or die("SQL语句执行失败");  </span></li>
<li class="alt">
<span>$</span><span class="attribute">row</span><span> = </span><span class="attribute-value">mysql_fetch_array</span><span>($query);  </span>
</li>
<li><span>//获得用户权限信息  </span></li>
<li class="alt">
<span>$</span><span class="attribute">flag</span><span> = $row['userflag'];  </span>
</li>
<li><span>//根据userflag的值输出不同的欢迎信息  </span></li>
<li class="alt">
<span>if($</span><span class="attribute">flag</span><span> == 1)  </span>
</li>
<li><span>echo "欢迎管理员".$_SESSION['username']<br>."登录系统";  </span></li>
<li class="alt">
<span>if($</span><span class="attribute">flag</span><span> == 0)  </span>
</li>
<li><span>echo "欢迎用户".$_SESSION['username']<br>."登录系统";  </span></li>
<li class="alt">
<span>echo "</span><span class="tag"><span> </span><span class="tag-name">a</span><span> </span><span class="attribute">href</span><span>=</span><span class="attribute-value">"logout.php"</span><span> <br></span><span class="attribute">href</span><span>=</span><span class="attribute-value">"logout.php"</span><span class="tag">></span><span>注销</span><span class="tag"><span> /a</span><span class="tag">></span><span>";  </span></span></span>
</li>
<li><span>}  </span></li>
<li class="alt"><span>else  </span></li>
<li><span>{  </span></li>
<li class="alt"><span>echo "您没有权限访问本页面";  </span></li>
<li><span>}  </span></li>
<li class="alt">
<span class="tag">?></span><span> </span>
</li>
<li><span class="tag"><span> ?php  </span></span></li>
<li class="alt"><span>setcookie("username");  </span></li>
<li><span>echo "注销成功";  </span></li>
<li class="alt">
<span class="tag">?></span><span> </span>
</li>
</ol>

登入後複製

以上及时PHP Cookie登录验证的实现方法。