警告：mysqli_fetch_assoc（）期望参数1为mysqli_result，[dupe]

Question

// Decide which tabs to display
function tabs()
{

//如果已登录，请访问mysql

$con =  mysqli_connect(DB_HOST, DB_USER, DB_PASS) or die(mysqli_error);

$ user = mysqli_fetch_assoc（mysqli_query（$ con，“SELECT * FROM users WHERE username ='”。$ _SESSION ['username']。“'”））;

    echo '<ul>';


    if($user['group'])

Answer 1

// Decide which tabs to display
function tabs()
{
    // If logged in, access mysql
                mysqli_connect(DB_HOST, DB_USER, DB_PASS) or die(mysqli_error);


        $user = mysqli_fetch_assoc(mysqli_query($con, "SELECT * FROM users WHERE username='" . $_SESSION['username'] . "'"));



    echo '<ul>';


    if($user['group'])
    {

Answer 2

这是错的......看看这里https://www.w3schools.com/php/php_mysql_select.asp我想你想用fetch_assoc