Question

可能重复：
_SESSION variable not working

您好我知道这是一个常见问题，但我认为我的代码没有任何问题，但我想知道为什么我的 $ _ SESSION ['myusername']; 没有显示当前登录的用户

下面是我的main.php：

<?php
session_start();
if(isset($_SESSION['myusername'])){
header("location: index.php");
}
echo "Hello " .$_SESSION['myusername'];
?>

我的checklogin.php

<?php
session_start();
$host="localhost"; // Host name 
$username="root"; // Mysql username 
$password=""; // Mysql password 
$db_name="dbscholaris"; // Database name 
$tbl_name="users"; // Table name 

// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");

// username and password sent from form 
$myusername = $_POST['myusername']; 
$mypassword = $_POST['mypassword']; 

// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);

// mysql_num_row is counting table row
$count=mysql_num_rows($result);

// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1){

// Register $myusername, $mypassword and redirect to file "main.php"
$_SESSION["myusername"] = $myusername;
$_SESSION["mypassword"] = $mypassword; 
header("location:main.php");
}
else {
echo "Wrong Username or Password";
}
?>

请帮我找到我失踪的东西。感谢

Answer 1

您必须将$ myusername和$ mypassword导出到$_SESSION，如下所示：

$_SESSION["myusername"] = stripslashes($myusername);
$_SESSION["mypassword"] = stripslashes($mypassword);

你忘记了作业。此外，您还必须撤消该变量的mysql_real_esacpe_string()。（或者之前存储一个非转义版本。）

此外，您应该确保会话已启动。这可以通过

完成

session_start();

在对$_SESSION进行任何读取或写入之前或通过设置php ini指令

session.auto_start = 1

Answer 2

尝试第一个代码

    <?php
     session_start();
     if(isset($_POST['myusername'])){
    $_POST['myusername'] = $_SESSION['myusername'];
      header("location: index.php");
       }
      echo "Hello " .$_SESSION['myusername'];
    ?>

Answer 3

我会解释它不允许你看到你的页面，因为你正在做if（isset（$ _ SESSION ['myusername']））并不是如果（！isset（$ _ SESSION [ '名为myUsername']））这告诉php会话myusername是否不存在转到index.php else ignore

用户名未显示PHP / MySQL

3 个答案: