如何使用SESSION检索登录的用户名，电子邮件？ 到网站

Question

当我尝试运行此代码时，我的网站处于托管状态，内容消失了，此代码有什么问题？ 还有其他显示下面代码结果的方法吗？

<?php
    session_start();
    $db = mysqli_connect('localhost', '******', '*******', '********'); //db connection is correct
    $sql = "SELECT name, email FROM users WHERE username = '" . $_SESSION['username'] . "' ";
    $result = mysql_query($sql);
    $row = mysql_fetch_array($result);
    echo "Hello, " . $row['name'] . " (" . $row['email'] . ").";
    ?>

Answer 1

在代码中使用mysqli函数：

session_start();
$db = mysqli_connect('localhost', '******', '*******', '********'); //db connection is correct
$sql = "SELECT name, email FROM users WHERE username = '" . $_SESSION['username'] . "' ";
$result = $db->query($sql);
$row = $result->fetch_array(MYSQLI_ASSOC);
echo "Hello, " . $row['name'] . " (" . $row['email'] . ").";