mysqli_fetch_assoc（）期望参数1为mysqli_result，null为，而mysqli_query（）期望参数1为mysqli，null为

Question

我从代码的这一部分得到2个错误，请告诉我如何修复：

•mysqli_query（）期望参数1为mysqli，null为null •mysqli_fetch_assoc（）期望参数1为mysqli_result，在

中给出null

$sql = "SELECT * FROM user";
    $result = mysqli_query($conn, $sql); //connect to the database, then run the sql query
    if (mysqli_num_rows($result) > 0) {
        while($row = mysqli_fetch_assoc($result)) {
            $id = $row['id'];
            $sqlImg = "SELECT * FROM profileimg WHERE userid = '$id' ";
            $resultImg = mysqli_query($sonn,$sqlImg); 
            while ($rowImg = mysqli_fetch_assoc($resultImg)) {
                echo "<div class ='user-container'>";
                    if ($rowImg['status'] == 0) {
                        echo "<img src='uploads/profile".$id.".jpg?".mt_rand()."'>";
                    } else {
                        echo "<img src='uploads/profiledefault.jpg'>";
                    }
                    echo "<p>".$row['username']."</p>";
                echo "</div>";
            }
        }
    }

Answer 1

$result = mysqli_query($conn, $sql); //connect to the database, then run the sql query

$ conn未定义。