php里面session传递不到值
打开index.php，如果没有登录就提示需要登录，并且给了login,php的连接，单击就可以登录，登录成功以后返回到index.php，但是我不知道哪里不对，总是不行。
index.php
<?php<br /> session_start();<br /> <br /> if(isset($_SESSION['user']) && $_SESSION['user']===1){<br /> echo 'welcome admin';<br /> }else{<br /> echo "plase login.<br><a href='login.php'>Login</a>";<br /> }Login.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br /><html xmlns="http://www.w3.org/1999/xhtml"><br /><head><br /><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><br /><title>请登录--后台管理系统</title><br /><style type="text/css"><br /><br /><br /></style><br /></head><br /><br /><body><br /> <form action="do.php" method="post"><br /> <table><br /> <br /> <tr><br /> <th>用户名</th><br /> <td><input type="text" maxlength="10" name="user" /></td><br /> </tr><br /> <br /> <tr><br /> <th>密码</th><br /> <td><input type="password" name="pass" maxlength="10" /></td><br /> </tr><br /> <tr><br /> <td colspan="2" align="center"><br /> <input type="submit" /><br /> <input type="reset" /><br /> </td><br /> </tr><br /> </table><br /> <br /> </form><br /><br /></body><br /></html><br />
do.php
<?php<br /><br />$link=mysql_connect('localhost','root','root123')or die('连接数据库失败');<br />mysql_select_db('test',$link)or die('不能选择数据库test');<br />mysql_query('set names utf8');<br /><br />$user=$_POST['user'];<br />$pass=$_POST['pass'];<br />if($user==''){<br /> echo '请填写用户名';<br /> exit();<br />}<br />if($pass==''){<br /> echo '请填写密码';<br /> exit();<br />}<br />$sql="select * from user where user='{$user}' and pass='{$pass}'";<br /><br />echo $sql;<br />$result=mysql_query($sql);<br />//var_dump($result);<br /><br /> if($result>0){<br /> $_SESSION['user']='222';<br /> //header("Location: index.php");<br /> echo '<pre class="brush:php;toolbar:false">';<br /> print_r($_SESSION);<br /> echo '';echo $_SESSION['user'];
}
?>
------解决方案--------------------
session_start()必须在.php的最上面，且do.php里也必须写上，祝你好运。
------解决方案--------------------
do.php 最頂加上session_start();
------解决方案--------------------
do.php加上session_start();
------解决方案--------------------
if(isset($_SESSION['user']) && $_SESSION['user']===1){首先你得确认你存的值一定是数值型的1,不然就不能用===来比较；
再者如果你do页面的登录后的输出是测试的话，如果echo不出你设置的session
那就是你的session没有开启
在do页面第一行 session_start();
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