PHP會話變量消失了嗎？

Question

我有3頁，login.php，login_validate.php和userhome.php。我的問題是，登錄信息正在正確傳遞給login_validate.php，但似乎消失login_validate重定向到userhome.php

任何幫助，將不勝感激。

的login.php

<form name="login" action="login_validate.php" method="post"> 
    Username: <input type="text" name="myusername" /><br /> 
    Password: <input type="password" name="mypassword" /><br /> 
    <input type="submit" value="Login" /> 
</form> 

login_validate.php（我知道，這是很長）

<?php 

    include'connect.php'; 

    // username and password sent from form 
    if(isset($_POST['myusername']) and isset($_POST['mypassword'])){ 
    $myusername=$_POST['myusername']; 
    $mypassword=$_POST['mypassword']; 
    }else{ 
    header('Location:login.php?failatvalidate'); 
    } 
    // 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); 

    $mypassword = hash('sha256', $mypassword); 

    $sql="SELECT * FROM users WHERE username='$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 "userhome.php" 
    $_SESSION['myusername'] = $myusername; 
    $_SESSION['mypassword'] = $mypassword; 

    print '<pre>'; 
    var_dump($_SESSION); 
    print '</pre>'; 

    echo "<a href='userhome.php'>Home</a>"; 
    } 
    else { 
    echo "Wrong Username or Password"; 
    } 
?> 

userhome.php

<?php 
    error_reporting(E_ALL^E_NOTICE); 
    ini_set('display_errors',1); 

    session_start(); 
    if(!isset($_SESSION['myusername'])){ 
    echo "error :("; 
    }else{ 
    echo "Logged in as ".$_SESSION['myusername']."&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp<a href='logout.php'>Log out</a><br /><br />"; 
    } 
?> 

Answer 1

你需要在每一個來調用session_start（）使用會話的腳本（並在發送標題之前）。