/SQL/Uncaught Error: Cannot use object of type mysqli_result as array

Uncaught Error: Cannot use object of type mysqli_result as array

$query = "SELECT 1";
$result = $mysqli->query($query);
$followingdata = $result->fetch_assoc()

Source: stackoverflow.com

Uncaught Error: Cannot use object of type mysqli_result as array

<?php 
    
    $conn = mysqli_connect("localhost", "root", "","ApplicationS");
        
            if (!$conn)
                    {
                die("ne pourrait pas se relier : ". mysqli_error ());
                    }
                    $id_ann= intval ($_GET['id_ann']);
 $contenu  = $conn->query('SELECT * from table_annance where id_ann = $id_ann ');
 
?> 
<font color="blue" ><h3> <marquee> modifier votre annonce </marquee> </h3> </font>
titre : <input type="text" name="titre_ann" value="<?php echo $contenu['titre_ann']; ?>"><br>
date debut : <input type="date" name="date_deb" value="<?php echo $contenu['date_deb']; ?>"><br>
date fin : <input type="date" name="date_fin" value="<?php echo $contenu['date_fin']; ?>"><br>

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