关于【会话控制】的题
一：COOKIE应用
*setcookie()函数：setcookie ("自设变量名", "传递的变量", time()+—毫秒数);
1.控制登录用户的过期时间
编写用户登陆界面
<table width="464" height="336" border="0" cellpadding="0" cellspacing="0" background="images/bg.JPG">
<tr>
<td width="107" height="136"> </td>
<td width="274"> </td>
<td width="83"> </td>
</tr>
<tr>
<td height="100"> </td>
<td align="center"><form name="form1" method="post" action="index_ok.php">
<p>
用户名：<input name="user" type="text" size="20">
</p>
<p>
密码：<input name="pass" type="password" maxlength="20">
</p>
<p>
<input type="submit" name="Submit" value="提交">
</p>
</form> <a href = "cookie.php"></a></td>
<td> </td>
</tr>
<tr>
<td height="100"> </td>
<td> </td>
<td> </td>
</tr>
</table>
处理界面，处理用户名和密码，并赋给cookie，设置cookie的过期时间，跳转到cookie.php界面
<?php header ( "Content-type: text/html; charset=UTF-8" ); //设置文件编码格式 if($_POST['user']!="" && $_POST['pass']!=""){ if($_POST['user']=="mr" && $_POST['pass']=="mrsoft"){ setCookie("user",$_POST['user'],time()+60)or die("禁止cookie"); setCookie("pass",$_POST['pass'],time()+60)or die("禁止cookie"); echo "<script>alert('登录成功！'); window.location.href='cookie.php';</script>"; }else{ echo "<script>alert('用户名或者密码不正确！'); window.location.href='index.php';</script>"; } }else{ echo "<script>alert('用户名或者密码不能为空！'); window.location.href='index.php';</script>"; } ?>
cookie.php界面
<?php if($_COOKIE['user']=="mr" && $_COOKIE['pass']=="mrsoft"){ echo "欢迎".$_COOKIE['user']."光临！"; }else{ echo "<script>alert('COOKIE已经过期，请重新登录'); window.location.href='index.php';</script>"; } ?>
2.删除客户端的cookie值
<table id="__01" width="580" height="440" border="0" cellpadding="0" cellspacing="0">
<tr>
<td colspan="3">
<img src="images/log_01.jpg" width="580" height="133" alt=""></td>
</tr>
<tr>
<td>
<img src="images/log_02.jpg" width="122" height="161" alt=""></td>
<td width="336" height="161"><form action="" method="post" class="STYLE1">
用户名：
<input name="name" type="text" id="name" />
<br>
<br>
密 码：
<input type="password" name="pwd" />
<br>
<br>
<i>保存时间：
<input name="check" type="radio" value="3600" checked="checked" />
1小时
<input name="check" type="radio" value="86400" />
24小时
<input name="check" type="radio" value="604800" />一星期</i><br>
<br>
<input type="submit"name="sub"value="确定" />
<input type="reset"name="res"value="重置" />
</form></td>
<td>
<img src="images/log_04.jpg" width="122" height="161" alt=""></td>
</tr>
<tr>
<td colspan="3">
<img src="images/log_05.jpg" width="580" height="146" alt=""></td>
</tr>
</table>
</body>
</html>
<?php
if($_POST['sub']){
if($_POST['name'] == "" || $_POST['pwd'] == ""){
echo "<script>alert('用户名或密码不能为空');location.href='index.php'</script>";
}else{
echo "<script>window.location.href='main.php'</script>";
}
}
?>
<?php if($_COOKIE['username']!="" &&$_COOKIE['pwd']!=""){ if(isset($_GET[cookie])){ setcookie("username","",time()-1); setcookie("pwd","",time()-1); setcookie("IP","",time()-1); echo "<script>alert('COOKIE已删除，确认退出？');location.href='index.php'</script>"; } ?> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>删除指定IP客户端的COOKIE</title> </head> <body> <img src="images/bg.jpg" width="761" height="559" border="0" usemap="#Map"> <map name="Map"><area shape="rect" coords="622,130,731,185" href="main.php?cookie=0"></map> </html> <?php if(!isset($_COOKIE['IP'])){ echo"<script>alert('在有限时间内未进行任何操作，请重新登录');location.href='index.php'</script>"; } }else{ echo"<script>alert('您没有正确登录，请重新登录');location.href='index.php'</script>"; } ?>
二：SESSION的用法
1.掌控用户登录的权限
详细代码略
2.屏蔽页面刷新对计数器的影响
<?php session_start(); if($_SESSION[temp]==""){ //判断$_SESSION[temp]==""的值是否为空,其中的temp为自定义的变量 if(($fp=fopen("counter.txt","r"))==false){ echo "打开文件失败!"; }else{ $counter=fgets($fp,1024); //读取文件中数据 fclose($fp); //关闭文本文件 $counter++; //计数器增加1 $fp=fopen("counter.txt","w"); //以写的方式打开文本文件<!----> fputs($fp,$counter); //将新的统计数据增加1 fclose($fp); } //关闭文 $_SESSION[temp]=1; //登录以后,$_SESSION[temp]的值不为空,给$_SESSION[temp]赋一个值1 } ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>屏蔽页面刷新对计数器的影响</title> </head> <body> <table id="__01" width="761" height="559" border="0" cellpadding="0" cellspacing="0"> <tr> <td colspan="3"> <img src="images/index_01.jpg" width="761" height="333" alt=""></td> </tr> <tr> <td> <img src="images/index_02.jpg" width="543" height="57" alt=""></td> <td width="207" height="57" background="images/index_03.jpg"><img src="gd1.php" /></td> <td> <img src="images/index_04.jpg" width="16" height="57" alt=""></td> </tr> <tr> <td colspan="3"> <img src="images/index_05.jpg" width="761" height="169" alt=""></td> </tr> </table>
<?php header ( "Content-type: text/html; charset=UTF-8" ); //设置文件编码格式 //以图形的形式输出数据库中的记录数 if(($fp=fopen("counter.txt","r"))==false){ echo "打开文件失败!"; }else{ $counter=fgets($fp,1024); fclose($fp); //通过GD2函数创建画布 $im=imagecreate(200,24); $gray=imagecolorallocate($im,255,255,255); $color =imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255)); //定义字体颜色 //输出中文字符 $text="网站的访问量:"; //对指定的中文字符串进行转换 $font = "Fonts/FZHCJW.TTF"; imagettftext($im,14,0,20,18,$color,$font,$text); //输出中文 //输出网站的访问次数 imagestring($im,5,160,5,$counter,$color); imagepng($im); imagedestroy($im); } ?>
3.在不同页面之间传递数据
if($_POST['user']!="" && $_POST['pwd']!=""){ //判断用户名和密码是否为空 if($_POST['user']=="mr" && $_POST['pwd']=="mrsoft"){ //判断管理员用户名和密码是否正确 $_SESSION['user'] = $_POST['user']; $_SESSION['pwd'] = $_POST['pwd']; $_SESSION['check'] = $_POST['check']; echo "<script>alert('管理员登录成功！');window.location.href='ini.php'</script>"; }else{ echo "<script>alert('用户名或者密码不正确！');window.location.href='index.php'</script>"; } }else{ echo "<script>alert('登录用户名或者密码不能为空！');window.location.href='index.php'</script>"; }
echo "当前时间：". date('Y-m-d H:i:s')."<br>"; echo "<br>"; echo "用户名：".$_SESSION['user']."<br>"; echo "<br>"; echo "密码：".$_SESSION['pwd']."<br>"; echo "<br>"; echo "时效：".$_SESSION['check']."秒<br>"; echo "<br>"; echo "<a href='logout.php'>退出</a>"; ?></td>
<?php session_start(); session_destroy(); echo "<script>alert('退出登录！');window.location.href='index.php';</script>"; ?>
4.session购物车
具体代码见购物车博客随笔
5.session更换聊天室界面
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>应用Session技术实现聊天室换肤</title> <style type="text/css"> <!-- .style6 { font-size: 24px; color: #000000; font-weight: bold; } .STYLE7 { font-size: 12px; color: #E32FDA; } body,td,th { font-size: 12px; } body { margin-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; } --> </style> </head> <?php $_SESSION['bgcolor']=$_GET['col']; ?> <body bgcolor="<?php if($_SESSION['bgcolor']==""){echo "white";}else{echo $_SESSION['bgcolor'];}?>"> <table width="780" border="0" align="center" cellpadding="0" cellspacing="0"> <tr align="center" valign="middle"> <td height="115" colspan="3" background="images/01.jpg" class="style6"><table width="700" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="227"> </td> <td width="349"> </td> <td width="106"><img src="images/02.jpg" width="240" height="89" border="0" usemap="#Map" /></td> </tr> </table></td> </tr> <tr valign="middle"> <td height="5" colspan="3" valign="top"></td> </tr> <tr valign="middle"> <td width="179" height="350" valign="top" bgcolor="#DFEEFF"><br> <span class="STYLE7"> ***进入聊天室，欢迎光临!!<br> <?php echo date("y-m-d h:i:s");?></span></td> <td width="2" valign="top"></td> <td width="700" valign="top" bgcolor="#FFFFFF"><p><br> </p> <p> 在这里显示聊天的内容，希望大家遵守聊天室的规则，</p> <p> 不要在聊天室中传播不健康的和非法的内容，谢谢合作！ </p> </span></td> </tr> <tr valign="middle"> <td height="2" colspan="3"></td> </tr> <tr valign="middle"> <td height="50" colspan="3" bgcolor="#FFC7FF"> 选择您喜欢的颜色，您的页面也将随即更新</td> </tr> </table> <map name="Map" id="Map"> <area shape="rect" coords="4,3,27,26" href="index.php?col=0066FF" /> <area shape="rect" coords="64,5,87,26" href="index.php?col=00CCFF" /> <area shape="rect" coords="31,34,55,56" href="index.php?col=999900" /> <area shape="rect" coords="218,64,237,85" href="index.php?col=CC9933" /> <area shape="rect" coords="184,33,209,55" href="index.php?col=CC6600" /><area shape="rect" coords="214,7,237,28" href="index.php?col=3399FF" /> <area shape="rect" coords="8,63,27,87" href="index.php?col=996633" /> <area shape="rect" coords="65,61,88,87" href="index.php?col=99CC33" /> <area shape="rect" coords="152,61,177,87" href="index.php?col=CC3333" /> </map></body> </html>
6.清理session
$_SESSION = array(); session_destroy(); echo "<script>alert('清理SESSION缓存成功');
