form in a foreach or while loop

Question

I have a form in a while loop for each post. I'm trying to create a form for each post so that you can like each post. Unfortunately, although I give each form a unique id with a hidden tag, my code only changes the first entry. I tried a lot to get the code to work. Hopefully someone can help me here.

<?php

$ipadresse = $_SERVER["REMOTE_ADDR"];

if(isset($_POST)){
    
    $vote = $_POST['vote'];
    $eintrag_id = $_POST['eintrag_id'];


 $statement = $pdo->prepare("SELECT reaction FROM reactionen WHERE eintrag = ? AND ipadresse = ?");
    $statement->execute(array($eintrag_id, $ipadresse));
    $reaction = $statement->fetch();
    if ($reaction !== false)
    {
        $stmt = $pdo->prepare("UPDATE reactionen
                SET reaction = :reaction WHERE eintrag = '{$eintrag_id}' AND ipadresse = '{$ipadresse}'");
        $stmt->execute(array('reaction' => $vote));
    }
    else
    {
        $insert = $pdo->prepare("INSERT INTO reactionen (eintrag, ipadresse, reaction)
                                  VALUES (:eintrag_id, :ipadresse, :reaction)");
        $insert->execute(array(
            'eintrag_id' => $eintrag_id,
            'ipadresse' => $ipadresse,
            'reaction' => $vote
        ));
    }
}


$statement = $pdo->prepare("SELECT id, imagedata, thema, beschreibung FROM weitere");
$statement->execute(array());  
while($thema = $statement->fetch())  {?>
                <div class="thumbnail">
                    <?php

                            $ergebnis = "SELECT MIN(id),imagedata FROM weitere WHERE id = '{$thema['id']}'";
                            $resultat = $pdo->query($ergebnis);
                            foreach ($resultat as $reihe):
                            if(isset($reihe['imagedata']) && $reihe['imagedata'] != '0'){?>
                    <img id="image" src="Bilder/<?php echo $reihe['imagedata'];?>">

                    <?php } endforeach; ?>

                    <span class="span">
                        <h3><?php echo $thema['thema']; ?></h3>
                    </span>
                    <p><?php echo nl2br($thema['beschreibung']); ?></p><br><br>
                     <form method="post" name="eintrag<?php echo $thema['id']; ?>">
        <input type="hidden" class="eintrag_id" name="eintrag_id" value="<?php echo $thema['id']; ?>">
        <table style="position:absolute; bottom:0px; left:0px; vertical-align:middle">
            <tr>
                <td><input type="radio" name="vote" id="hoch" value="1" onchange="document.eintrag<?php echo $thema['id']; ?>.submit(); return false;">
                    <label for="hoch"><img src="Bilder/hoch.png"></label></td>
                <td>
                    <p <?php

        $statement1 = $pdo->prepare("SELECT COUNT(*) AS anzahl FROM reactionen WHERE reaction = '1' AND eintrag = ?");
        $statement1->execute(array($thema['id']));  
        $like = $statement1->fetch(); ?>><?php  echo $like['anzahl'];?></p>
                </td>
                <td>
                    <input type="radio" name="vote" id="runter" value="-1" onchange="document.eintrag<?php echo $thema['id']; ?>.submit(); return false;">
                    <label for="runter"><img src="Bilder/runter.png"></label></td>
                <td>
                    <p <?php

$statement2 = $pdo->prepare("SELECT COUNT(*) AS anzahl FROM reactionen WHERE reaction = '-1' AND eintrag = ?");
        $statement2->execute(array($thema['id']));  
        $dislike = $statement2->fetch(); ?>><?php  echo $dislike['anzahl'];?></p>
            </tr>
        </table>
    </form>
                    <div id="break"></div>
                    <a href="kasse.php?titel=<?php echo rawurlencode($thema['thema']); ?>&id=<?php echo $thema['id']; ?>">
                        <img src="Bilder/pay.png" class="img" />
                    </a>
                </div>
                <?php } ?>