Question

我的登录时遇到问题，当我第一次打开浏览器时，我需要做2次登录才能重定向到我的索引。之后我可以退出并登录，一切正常。

我的登录代码：

    <?php
include "connect.php";

session_start();
if (isset($_POST['user_login'])) {
    $state_on = 1;
    $state_off = 0;
    $user = $conn->prepare("SELECT * FROM users WHERE username=:name AND password=:pword AND state=:s");
    $user->bindParam(":name", $_POST['username']);
    $user->bindParam(":pword", $_POST['password']);
    $user->bindParam(":s", $state_on);
    $user->execute();
    if ($user->rowCount() > 0) {
        $row_user = $user->fetch(PDO::FETCH_ASSOC);
        $user_id = $row_user['id_user'];
        $user_session = $row_user['session_id'];
        $user_lvl = $row_user['id_lvl'];
        $update_session = $conn->prepare("UPDATE users SET session_id =:idsession WHERE id_user=:iduser");
        $update_session->bindParam(":iduser", $user_id);
        $update_session->bindParam(":idsession", session_id());
        $update_session->execute();
        $_SESSION['session_id'] = $user_session;
        $_SESSION['id_user'] = $user_id;
        $_SESSION['id_lvl'] = $user_lvl;

    header("Location: index.php");

//        echo 'login = SUCCESS!';
    } else {
//            echo 'login = FAIL!';
    }
}

这是我在index中包含的session.php。 PHP

session_start();
include "connect.php";

$login_session = $_SESSION['session_id'];
$login_user = $_SESSION['id_user'];
$login_nvlseg_user = $_SESSION['id_lvl'];

if (!isset($login_session)) {
    $conn = null;
    header('Location: login.php');
}
try {
    $session_sql = "SELECT * FROM users WHERE session_id=:session";
    $stmt = $conn->prepare($session_sql);
    $stmt->bindParam(":session", $login_session);
    $stmt->execute();
    if ($stmt->rowCount() == 0) {
        session_unset();
        $conn = null;
        header('Location: login.php');
    }
    } catch (PDOException $e) {
    // 

   echo "Error: " . $e->getMessage();
}

由于

Answer 1

在检查$ _POST之前，您必须检查用户是否已登录。

在它面前会是这样的：

  session_start();
if (isset($_SESSION['id_user']) {
  // redirect
  header("Location: index.php");
}

Answer 2

您需要将session_start放在脚本之上，如下所示：

<?php
# session_start() should be on top when you using sessions
session_start();
include "connect.php";


if (isset($_POST['user_login'])) {
    $state_on = 1;
    $state_off = 0;
    $user = $conn->prepare("SELECT * FROM users WHERE username=:name AND password=:pword AND state=:s");
    $user->bindParam(":name", $_POST['username']);
    $user->bindParam(":pword", $_POST['password']);
    $user->bindParam(":s", $state_on);
    $user->execute();
    if ($user->rowCount() > 0) {
        $row_user = $user->fetch(PDO::FETCH_ASSOC);
        $user_id = $row_user['id_user'];
        $user_session = $row_user['session_id'];
        $user_lvl = $row_user['id_lvl'];
        $update_session = $conn->prepare("UPDATE users SET session_id =:idsession WHERE id_user=:iduser");
        $update_session->bindParam(":iduser", $user_id);
        $update_session->bindParam(":idsession", session_id());
        $update_session->execute();
        $_SESSION['session_id'] = $user_session;
        $_SESSION['id_user'] = $user_id;
        $_SESSION['id_lvl'] = $user_lvl;

    header("Location: index.php");

//        echo 'login = SUCCESS!';
    } else {
//            echo 'login = FAIL!';
    }
}

我希望这能解决你的问题！

PHP登录无法正常工作

2 个答案: