Question

我似乎无法显示当前登录用户的信息。我不确定我在这里做错了什么。我的登录页面和注销功能正常工作，当我注册用户时，它将该用户添加到数据库中，但我希望能够在登录时显示当前用户数据。

<?php 
session_start();

// connects to the database
$mysqli = new mysqli("localhost", "root", "");


$query = "SELECT firstName, lastName, username, password, loyaltyPoints FROM user WHERE username = '".$_SESSION['username']."'";

if($result = $mysqli->query($query))
{
while($row = $result->fetch_assoc())
{

    echo $row['firstName'];
    echo $row['lastName'];
    echo $row['username'];
    echo $row['password'];
    echo $row['loyaltyPoints'];

}
$result->free();
}
else
{
echo "No results found";
}
?>

<html>

<head>  
</head>
<body>
Welcome! Click here to <a href="logout.php" tite="Logout">Logout.</a>
    or here to go to the home page --> <a href ="INDEX.html">HOME</a>
</body>
</html>

Answer 1

首先，您还没有选择任何数据库。先做。

您当前的代码：

$mysqli = new mysqli("localhost", "root", ""); // missing fourth parameter

在那里添加。

<?php

error_reporting(E_ALL);
ini_set('display_errors', '1');
session_start();

// connects to the database
$mysqli = new mysqli('localhost', 'root', '', 'DATABASE NAME'); // add the database name (fourth parameter)

if(empty($_SESSION['username'])) {
    echo 'not logged in';
    exit;
}

$query = "SELECT firstName, lastName, username, password, loyaltyPoints FROM user WHERE username = '{$_SESSION['username']}'";
$result = $mysqli->query($query) or die($mysqli->error);

if($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {

    //  echo $row['firstName'];
    //  echo $row['lastName'];
    //  echo $row['username'];
    //  echo $row['password'];
    //  echo $row['loyaltyPoints'];

        foreach($row as $val) {
            echo "$val <br/>";
        }
    }   
} 

else {
    echo 'not found';
}

?>

<html>

<head>  
</head>
<body>
Welcome! Click here to <a href="logout.php" tite="Logout">Logout.</a>
    or here to go to the home page --> <a href ="INDEX.html">HOME</a>
</body>
</html>

PHP检索当前登录用户的数据

1 个答案: