阵列到字符串转换（不能让它工作）

Question

好的我想拉一个特定的数据行对应于我的网页上登录的用户名我已经开始我的会话，但由于某种原因，我不能得到代码工作。我不断收到一个“数组到字符串转换”的行WHERE用户名='$ _SESSION [用户]'“）;”我做错了什么？如果我设置用户名=我需要它来从会话ID会画画，所以它会根据登录卫生组织显示不同的值。

<?php 


require("common.php"); 


if(empty($_SESSION['user'])) 
{ 

    header("Location: login.php"); 


    die("Redirecting to login.php"); 
} 


?> 





<?php 

$con=mysqli_connect("localhost","root","nathan","site"); 
// Check connection 
if (mysqli_connect_errno()) 
{ 
echo "Failed to connect to MySQL: " . mysqli_connect_error(); 
} 

$result = mysqli_query($con,"SELECT * FROM users 
WHERE username = '".$_SESSION['user']."'"); 

while($row = mysqli_fetch_array($result)) 
{ 
echo $row['username'] . " " . $row['att']; 
echo "<br>"; 
} 
?> 

here are my other corresponding files 

<?php 


$username = "root"; 
$password = "nathan"; 
$host = "localhost"; 
$dbname = "site"; 




$options = array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'); 


try 
{ 


$db = new PDO("mysql:host={$host};dbname={$dbname};charset=utf8",                        $username,      $password,    $options); 
} 
catch(PDOException $ex) 
{ 

    die("Failed to connect to the database: " . $ex->getMessage()); 
} 


$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 


$db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); 


if(function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc()) 
{ 
    function undo_magic_quotes_gpc(&$array) 
    { 
     foreach($array as &$value) 
     { 
      if(is_array($value)) 
      { 
       undo_magic_quotes_gpc($value); 
      } 
      else 
      { 
       $value = stripslashes($value); 
      } 
     } 
    } 

    undo_magic_quotes_gpc($_POST); 
    undo_magic_quotes_gpc($_GET); 
    undo_magic_quotes_gpc($_COOKIE); 
} 


header('Content-Type: text/html; charset=utf-8'); 


session_start(); 

和我的login文件

<?php 


require("common.php"); 


$submitted_username = ''; 



if(!empty($_POST)) 
{ 

    $query = " 
     SELECT 
      id, 
      username, 
      password, 
      salt, 
      email 
     FROM users 
     WHERE 
      username = :username 
    "; 


    $query_params = array( 
     ':username' => $_POST['username'] 
    ); 

    try 
    { 

     $stmt = $db->prepare($query); 
     $result = $stmt->execute($query_params); 
    } 
    catch(PDOException $ex) 
    { 

     die("Failed to run query: " . $ex->getMessage()); 
    } 


    $login_ok = false; 


    $row = $stmt->fetch(); 
    if($row) 
    { 

     $check_password = hash('sha256', $_POST['password'] . $row['salt']); 
     for($round = 0; $round < 65536; $round++) 
     { 
      $check_password = hash('sha256', $check_password . $row['salt']); 
     } 

     if($check_password === $row['password']) 
     { 

      $login_ok = true; 
     } 
    } 


    if($login_ok) 
    { 

     unset($row['salt']); 
     unset($row['password']); 


     $_SESSION['user'] = $row; 


     header("Location: private.php"); 
     die("Redirecting to: private.php"); 
    } 
    else 
    { 

     print("Login Failed."); 


     $submitted_username = htmlentities($_POST['username'], ENT_QUOTES, 'UTF-8'); 
    } 
} 

?> 
<h1>Login</h1> 
<form action="login.php" method="post"> 
Username:<br /> 
<input type="text" name="username" value="<?php echo $submitted_username; ?>" /> 
<br /><br /> 
Password:<br /> 
<input type="password" name="password" value="" /> 
<br /><br /> 
<input type="submit" value="Login" /> 
</form> 
<a href="register.php">Register</a> 

Answer 1

也许这会工作？

<?php 
session_start(); 
$con=mysqli_connect("localhost","root","xxx","xxxx"); 
// Check connection 
if (mysqli_connect_errno()) 
{ 
echo "Failed to connect to MySQL: " . mysqli_connect_error(); 
} 

$result = mysqli_query($con,"SELECT * FROM users 
WHERE username = '".$_SESSION['user']."'"); 

while($row = mysqli_fetch_array($result)) 
{ 
echo $row['username'] . " " . $row['att']; 
echo "<br>"; 
} 
?> 

Answer 2

您收到此错误的原因很简单。是你的$_SESSION['user'];是逸岸数组..此错误消息的一个简单的例子：

$Array = array (1,2,3,4,5); 
echo $Array; 

这就是你的错误..

所以我没有看到实际的$_SESSION变量..建议是执行：

echo "<pre>"; 
print_r($_SESSION); 
echo "</pre>"; 

这将显示你的整个会话数组，并会告诉你我告诉你什么。

---

随着你说了什么。

$Username_Values = $_SESSION['user']; 
$Username_Values['username']; // Will output the user name