$sql = "SELECT * FROM users WHERE id";

hvorfor viser denne kode alle bruger og ikke kun den loggede ind bruger

<?php

// Check if the user is logged in, if not then redirect him to login page
if(!isset($_SESSION["loggedin"]) || $_SESSION["loggedin"] !== true){
    header("location: login.php");
    exit;
}

// Attempt select query execution
$sql = "SELECT * FROM users WHERE id";
$result = mysqli_query($link, $sql);
$resultCheck = mysqli_num_rows($result);
 
if ($resultCheck > 0) {
        while ($row = mysqli_fetch_assoc($result)) {