我是php的新手。我试图使用session来存储用户ID。但是，showSession.php在id部分中不打印任何内容。我错过了代码中的任何内容吗？谢谢！
loginfb.php用于访问数据库
<?php
session_start();
//Load the database configuration file
require("config.inc.php");
//Convert JSON data into PHP variable
$userData = json_decode($_POST['userData']);
if(!empty($userData)){
$oauth_provider = $_POST['oauth_provider'];
//Check whether user data already exists in database
$prevQuery = "SELECT * FROM users WHERE oauth_provider = '".$oauth_provider."' AND oauth_uid = '".$userData->id."'";
try {
$stmt = $db->prepare($prevQuery);
$result = $stmt->execute();
}
catch (PDOException $ex) {
$response["success"] = 0;
$response["message"] = "Database Error!";
die(json_encode($response));
}
$rows = $stmt->fetchAll();
if($rows){
//Update user data if already exists
$query = "UPDATE users SET first_name = '".$userData->first_name."', last_name = '".$userData->last_name."', email = '".$userData->email."', gender = '".$userData->gender."', locale = '".$userData->locale."', picture = '".$userData->picture->data->url."', link = '".$userData->link."', modified = '".date("Y-m-d H:i:s")."' WHERE oauth_provider = '".$oauth_provider."' AND oauth_uid = '".$userData->id."'";
$update = $db->query($query);
$_SESSION["id"] = $rows['id'];
}else{
//Insert user data
$query = "INSERT INTO users SET oauth_provider = '".$oauth_provider."', oauth_uid = '".$userData->id."', first_name = '".$userData->first_name."', last_name = '".$userData->last_name."', email = '".$userData->email."', gender = '".$userData->gender."', locale = '".$userData->locale."', picture = '".$userData->picture->data->url."', link = '".$userData->link."', created = '".date("Y-m-d H:i:s")."', modified = '".date("Y-m-d H:i:s")."'";
$insert = $db->query($query);
$getSession = "SELECT * FROM users WHERE oauth_provider = '".$oauth_provider."' AND oauth_uid = '".$userData->id."'";
try {
$stmt1 = $db->prepare($getSession);
$result1 = $stmt1->execute();
}
catch (PDOException $ex) {
$response["success"] = 0;
$response["message"] = "Database Error!";
die(json_encode($response));
}
$rows1 = $stmt1->fetchAll();
if($rows1){
$_SESSION["id"] = $rows1['id'];
}
}
}
?>
showSession.php用于打印会话ID。
<?php
session_start();
echo session_id();
$id=$_SESSION['id'];
echo "Session id is " . $_SESSION["id"] . ".<br>";
echo "Session id is " . $id . ".<br>";
print_r($_SESSION);
?>
login.html是允许用户使用facebook帐户登录的用户界面。
<!DOCTYPE html>
<html>
<style>
form {
border: 3px solid #f1f1f1;
}
input[type=text], input[type=password] {
width: 100%;
padding: 12px 20px;
margin: 8px 0;
display: inline-block;
border: 1px solid #ccc;
box-sizing: border-box;
}
button {
background-color: #4CAF50;
color: white;
padding: 14px 20px;
margin: 8px 0;
border: none;
cursor: pointer;
width: 100%;
}
button:hover {
opacity: 0.8;
}
.registerbtn {
width: auto;
padding: 10px 18px;
background-color: #f44336;
}
.imgcontainer {
text-align: center;
margin: 24px 0 12px 0;
}
img.avatar {
width: 40%;
border-radius: 50%;
}
.container {
padding: 16px;
}
span.psw {
float: right;
padding-top: 16px;
}
/* Change styles for span and cancel button on extra small screens */
@media screen and (max-width: 300px) {
span.psw {
display: block;
float: none;
}
.registerbtn {
width: 100%;
}
}
</style>
<body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<script>
window.fbAsyncInit = function() {
// FB JavaScript SDK configuration and setup
FB.init({
appId : '1537121876329962', // FB App ID
cookie : true, // enable cookies to allow the server to access the session
xfbml : true, // parse social plugins on this page
version : 'v2.8' // use graph api version 2.8
});
FB.Event.subscribe('auth.login', function(){
window.location.href = 'showSession.php';
});
FB.Event.subscribe('auth.logout', function(){
window.location.href = 'login.html';
});
// Check whether the user already logged in
FB.getLoginStatus(function(response) {
if (response.status === 'connected') {
//display user data
getFbUserData();
}
});
};
// Load the JavaScript SDK asynchronously
(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
// Facebook login with JavaScript SDK
function fbLogin() {
FB.login(function (response) {
if (response.authResponse) {
// Get and display the user profile data
getFbUserData();
} else {
document.getElementById('status').innerHTML = 'User cancelled login or did not fully authorize.';
}
}, {scope: 'email'});
}
// Fetch the user profile data from facebook
function getFbUserData(){
FB.api('/me', {locale: 'en_US', fields: 'id,first_name,last_name,email,link,gender,locale,picture'},
function (response) {
document.getElementById('fbLink').setAttribute("onclick","fbLogout()");
document.getElementById('fbLink').innerHTML = 'Logout from Facebook';
document.getElementById('status').innerHTML = 'Thanks for logging in, ' + response.first_name + '!';
document.getElementById('userData').innerHTML = '<p><b>FB ID:</b> '+response.id+'</p><p><b>Name:</b> '+response.first_name+' '+response.last_name+'</p><p><b>Email:</b> '+response.email+'</p><p><b>Gender:</b> '+response.gender+'</p><p><b>Locale:</b> '+response.locale+'</p><p><b>Picture:</b> <img src="'+response.picture.data.url+'"/></p><p><b>FB Profile:</b> <a target="_blank" href="'+response.link+'">click to view profile</a></p>';
// Save user data
saveUserData(response);
});
}
// Logout from facebook
function fbLogout() {
FB.logout(function() {
document.getElementById('fbLink').setAttribute("onclick","fbLogin()");
document.getElementById('fbLink').innerHTML = '<img src="fblogin.png"/>';
document.getElementById('userData').innerHTML = '';
document.getElementById('status').innerHTML = 'You have successfully logout from Facebook.';
});
}
// Save user data to the database
function saveUserData(userData){
$.post('loginfb.php', {oauth_provider:'facebook',userData: JSON.stringify(userData)}, function(data){ return true; });
}
</script>
<h2>Login Form</h2>
<form action="loginUser.php" method="post">
<div class="imgcontainer">
<img src="img_avatar2.png" alt="Avatar" class="avatar">
</div>
<div class="container">
<label><b>Username</b></label>
<input type="text" placeholder="Enter Username" name="username" required>
<label><b>Password</b></label>
<input type="password" placeholder="Enter Password" name="password" required>
<button type="submit">Login</button>
<input type="checkbox" checked="checked"> Remember me
</div>
<div class="container" style="background-color:#f1f1f1">
<button type="button" class="registerbtn" onclick="location.href='register.html'">Register</button>
<span class="psw">Forgot <a href="#">password?</a></span>
</div>
</form>
<!--
<div
class="fb-like"
data-share="true"
data-width="450"
data-show-faces="true">
</div>
-->
<!--
<div id="status"></div>
-->
<!-- Facebook login or logout button -->
<a href="javascript:void(0);" onclick="fbLogin()" id="fbLink"><img src="fblogin.png"/></a>
<!--
<div id="userData"></div>
-->
</body>
</html>
答案 0 :(得分：0)
可能是因为你的程序的这部分没有执行。
$rows1 = $stmt1->fetchAll();
if($rows1){
$_SESSION["id"] = $row['id'];
}
在此原因如果if条件未接近，则数据将不会存储在session中。尝试在上面的if condition中打印出一个字符串，看它是否正在执行。
答案 1 :(得分：0)
您可以尝试使用下面的代码，因为我可以看到一些变量命名问题。希望这会有所帮助
<?php
session_start();
//Load the database configuration file
require("config.inc.php");
//Convert JSON data into PHP variable
$userData = json_decode($_POST['userData']);
if(!empty($userData)){
$oauth_provider = $_POST['oauth_provider'];
//Check whether user data already exists in database
$prevQuery = "SELECT * FROM users WHERE oauth_provider = '".$oauth_provider."' AND oauth_uid = '".$userData->id."'";
try {
$stmt = $db->prepare($prevQuery);
$result = $stmt->execute();
}
catch (PDOException $ex) {
$response["success"] = 0;
$response["message"] = "Database Error!";
die(json_encode($response));
}
$rows = $stmt->fetchAll();
if($rows){
//Update user data if already exists
$query = "UPDATE users SET first_name = '".$userData->first_name."', last_name = '".$userData->last_name."', email = '".$userData->email."', gender = '".$userData->gender."', locale = '".$userData->locale."', picture = '".$userData->picture->data->url."', link = '".$userData->link."', modified = '".date("Y-m-d H:i:s")."' WHERE oauth_provider = '".$oauth_provider."' AND oauth_uid = '".$userData->id."'";
$update = $db->query($query);
$_SESSION["id"] = $rows['id']; //changed $row with $rows
}else{
//Insert user data
$query = "INSERT INTO users SET oauth_provider = '".$oauth_provider."', oauth_uid = '".$userData->id."', first_name = '".$userData->first_name."', last_name = '".$userData->last_name."', email = '".$userData->email."', gender = '".$userData->gender."', locale = '".$userData->locale."', picture = '".$userData->picture->data->url."', link = '".$userData->link."', created = '".date("Y-m-d H:i:s")."', modified = '".date("Y-m-d H:i:s")."'";
$insert = $db->query($query);
$getSession = "SELECT * FROM users WHERE oauth_provider = '".$oauth_provider."' AND oauth_uid = '".$userData->id."'";
try {
$stmt1 = $db->prepare($getSession);
$result1 = $stmt1->execute();
}
catch (PDOException $ex) {
$response["success"] = 0;
$response["message"] = "Database Error!";
die(json_encode($response));
}
$rows1 = $stmt1->fetchAll();
if($rows1){
$_SESSION["id"] = $rows1['id']; //changed $row with $rows1
}
}
}
?>