【发布时间】：2019-08-12 00:05:57
【问题描述】：
我最近切换到另一个主机...所以我不得不更改整个数据库名称和凭据，但现在我的一个登录不再工作了。
我的用户登录完美无缺，但我的管理员登录无法使用，因为我更改了主机。
他现在给我这个错误：
警告：session_start() [function.session-start]：当标头已在 /****/*************/***/** 中发送时无法启动会话******/news_login.php 在第 2 行
我会很感激你的回答:)
我不知道该怎么办
<?php
session_start();
require_once 'mysql.php';
$db = new DB();
?>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>Euro Trans GmbH | Admin LogIn</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
<script src="https://kit.fontawesome.com/c96bf7b876.js"></script>
<style>
.bd-placeholder-img {
font-size: 1.125rem;
text-anchor: middle;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
@media (min-width: 768px) {
.bd-placeholder-img-lg {
font-size: 3.5rem;
}
}
body {
display: -ms-flexbox;
display: flex;
-ms-flex-align: center;
align-items: center;
padding-top: 40px;
padding-bottom: 40px;
background-color: #333333;
}
form {
position: absolute;
top: 50%;
left: 50%;
transform: translateX(-50%) translateY(-50%);
}
</style>
</head>
<body class="text-center">
<?php
if($db->isUserLoggedIn() === TRUE) {
echo "<div style='position: absolute; top: 50%; left: 50%; transform: translateX(-50%) translateY(-50%);'><p style='color: white;'>Du bist bereits eingeloggt!</p><a href='logout.php' class='btn btn-outline-success my-2 my-sm-0' type='submit' alt='Ausloggen'>Ausloggen</a></div>";
} else {
if(isset($_POST['einloggen'])) {
$email = $_POST['email'];
$passwort = sha1($_POST['passwort']);
if($db->login($email, $passwort) === TRUE) {
echo "<br /><p>Erfolgreich eingeloggt!</p><br />";
} else {
echo "<br />Einloggen fehlgeschlagen!<br />";
}
}
?>
<form class="form-signin" action="news_login.php" method="POST">
<img src="images/default.png" alt="logo" width="200" height="200" style="border-radius: 20px; margin-right: 5%;">
<h1 class="h3 mb-3 font-weight-normal" style="color: white;">Administrator Login</h1>
<label for="inputEmail" class="sr-only">Email-Adresse</label>
<input type="email" style="margin-top: 30px;" name="email" class="form-control" placeholder="Email-Adresse" required autofocus>
<label for="inputPassword" class="sr-only">Passwort</label>
<input type="password" style="margin-top: 3px;" name="passwort" class="form-control" placeholder="Passwort" required>
<button class="btn btn-lg btn-primary btn-block" type="submit" name="einloggen" style="margin-top: 20px;">Einloggen</button>
<br>
<p><a href="index.php" style="color: white; text-decoration: underline;">Zurück zu Startseite</a></p>
<p class="mt-5 mb-3 text-muted">© <script>document.write(new Date().getFullYear());</script> by Euro Trans GmbH. All Rights Reserved</p>
</form>
<?php
}
?>
</body>
</html>
<?php
class DB {
private static $_db_username = "***********";
private static $_db_password = "***************";
private static $_db_host = "*******";
private static $_db_name = "*************";
private static $_db;
function __construct() {
try {
self::$_db = new PDO("mysql:host=" . self::$_db_host . ";dbname=" . self::$_db_name, self::$_db_username, self::$_db_password);
} catch (PDOException $e) {
echo "Datenbankverbindung gescheitert!";
die();
}
}
function isUserLoggedIn() {
$stmt = self::$_db->prepare("SELECT user_id FROM admins WHERE Session=:sid");
$sid = session_id();
$stmt->bindParam(":sid", $sid);
$stmt->execute();
if($stmt->rowCount() === 1) {
return true;
} else {
return false;
}
}
function login($userMail, $pw) {
$stmt = self::$_db->prepare("SELECT user_id FROM admins WHERE Email=:usermail AND Passwort=:pw");
$stmt->bindParam(":usermail", $userMail);
$stmt->bindParam(":pw", $pw);
$stmt->execute();
if ($stmt->rowCount() === 1) {
$stmt = self::$_db->prepare("Update admins SET Session=:sid WHERE Email=:usermail AND Passwort=:pw");
$sid = session_id();
$stmt->bindParam(":sid", $sid);
$stmt->bindParam(":usermail", $userMail);
$stmt->bindParam(":pw", $pw);
$stmt->execute();
return true;
} else {
return false;
}
}
function logout() {
$stmt = self::$_db->prepare("Update admins SET Session='' WHERE Session=:sid");
$sid = session_id();
$stmt->bindParam(":sid", $sid);
$stmt->execute();
}
function getAllEntries($sort = "DESC") {
if ($sort != "ASC" && $sort != "DESC") {
return -1;
}
$stmt = self::$_db->prepare("SELECT eintraege.eintrag_id, eintraege.header, eintraege.datum, eintraege.eintrag, admins.Vorname, admins.Nachname FROM eintraege INNER JOIN admins ON eintraege.autor = admins.user_id ORDER BY datum " . $sort);
$stmt->execute();
return $stmt->fetchAll(PDO::FETCH_ASSOC);
}
function createNewNews($titel, $news) {
$stmt = self::$_db->prepare("INSERT INTO eintraege (header, eintrag, autor) VALUES(:titel, :news, :autor)");
$autorID = self::getUserID();
$stmt->bindParam(":titel", $titel);
$stmt->bindParam(":news", $news);
$stmt->bindParam(":autor", $autorID);
if($stmt->execute()) {
return true;
} else {
return false;
}
}
function getUserID() {
$stmt = self::$_db->prepare("SELECT user_id FROM admins WHERE Session=:sid");
$sid = session_id();
$stmt->bindParam(":sid", $sid);
$stmt->execute();
return $stmt->fetch(PDO::FETCH_OBJ)->user_id;
}
function getUserName() {
$stmt = self::$_db->prepare("SELECT Vorname, Nachname FROM admins WHERE Session=:sid");
$sid = session_id();
$stmt->bindParam(":sid", $sid);
$stmt->execute();
$user = $stmt->fetch(PDO::FETCH_OBJ);
return $user->Vorname . " " . $user->Nachname;
}
function getUserNameByID($userID) {
$stmt = self::$_db->prepare("SELECT Vorname, Nachname FROM admins WHERE user_id=:userid");
$stmt->bindParam(":userid", $userID);
if($stmt->execute()) {
if ($stmt->rowCount() === 1) {
$user = $stmt->fetch(PDO::FETCH_OBJ);
return $user->Vorname . " " . $user->Nachname;
} else {
return "";
}
} else {
return "";
}
}
function getEntryByID($id) {
$stmt = self::$_db->prepare("SELECT * FROM eintraege INNER JOIN admins ON eintraege.Autor = admins.user_id WHERE eintrag_id=:id");
$stmt->bindParam(":id", $id);
if ($stmt->execute()) {
if ($stmt->rowCount() === 1) {
return $stmt->fetch(PDO::FETCH_OBJ);
} else {
return false;
}
} else {
return false;
}
}
function editEntry($titel, $news, $date, $id) {
$stmt = self::$_db->prepare("UPDATE eintraege SET
datum=:datum,
header=:titel,
eintrag=:news
WHERE eintrag_id=:id");
$date = date('Y-m-d H:i:s', strtotime($date));
$stmt->bindParam(":id", $id);
$stmt->bindParam(":datum", $date);
$stmt->bindParam(":news", $news);
$stmt->bindParam(":titel", $titel);
if($stmt->execute()) {
return true;
} else {
return false;
}
}
function deleteEntry($id) {
$stmt = self::$_db->prepare("DELETE FROM eintraege WHERE eintrag_id=:id");
$stmt->bindParam(":id", $id);
if($stmt->execute()) {
return true;
} else {
return false;
}
}
}
?>
我希望没有错误，但实际上我有一个错误......
错误：
“警告：session_start() [function.session-start]：当标头已在 /*****/*******/*******/** 中发送时无法启动会话**/news_login.php 在第 2 行"
【问题讨论】：
标签： php html twitter-bootstrap