How to use SELECT(sql) with multiple checkboxes?

I have 2 multiple checkboxes and have problems to display it correct if more than one checkbox is ticked. Only the last checkbox get used for the filter in the Select query. I was searching a lot in the web, but I don't find someone who has also a problem with this.

HTML Code:

<aside><h3>Filter:</h3>
    <details open="open">
    <summary><label>Categorie</label></summary>
        <div>
            <label>
            <input  type="checkbox" name="filter_categorie[]" value="dog">
            Dogs
            </label>
        </div>
        <div>
            <label>
            <input  type="checkbox" name="filter_categorie[]" value="fish">
            Fishes
            </label>
        </div>
        <div>
            <label>
            <input  type="checkbox" name="filter_categorie[]" value="other">
            Other
            </label>
        </div>
    </details>
    <details>
    <summary><label>Land</label></summary>
        <div>
            <label>
            <input  type="checkbox" name="filter_country[]" value="germany">
            Germany
            </label>
        </div>
        <div>
            <label>
            <input  type="checkbox" name="filter_country[]" value="austria">
            Austria
            </label>
        </div>
    </details>

    <br><input type='submit' name ='update' value='Update'>

PHP Code:

include("server.inc");
$cxn = mysqli_connect($host,$user,$password,$database) or die ("No connection to Server");
if(isset($_POST['update']) ){
    foreach ($_POST['filter_categorie[]'] as $item){
        $query = "
        SELECT * 
          FROM artikel 
         WHERE Categorie=\"{$_POST['filter_categorie']}\"
";}
$resultat = mysqli_query($cxn,$query) or die ("No results.");