PHP PDO not returning anything if value isn't %

results.php

<?php

$error = "";

if(isset($_POST['submit'])){    

    if(empty($_POST['A1'])){ $a1 = ""; } else { $a1 = '(^|,)A1(,|$)'; }
    if(empty($_POST['A2'])){ $a2 = ""; } else { $a2 = '(^|,)A2(,|$)'; }
    if(empty($_POST['A'])){ $a = ""; } else { $a = '(^|,)A(,|$)'; }
    if(empty($_POST['B1'])){ $b1 = ""; } else { $b1 = '(^|,)B1(,|$)'; }
    if(empty($_POST['B'])){ $b = ""; } else { $b = '(^|,)B(,|$)'; }
    if(empty($_POST['BE'])){ $be = ""; } else { $be = '(^|,)BE(,|$)'; }
    if(empty($_POST['C1'])){ $c1 = ""; } else { $c1 = '(^|,)C1(,|$)'; }
    if(empty($_POST['C1E'])){ $c1e = ""; } else { $c1e = '(^|,)C1E(,|$)'; }
    if(empty($_POST['C'])){ $c = ""; } else { $c = '(^|,)C(,|$)'; }
    if(empty($_POST['CE'])){ $ce = ""; } else { $ce = '(^|,)CE(,|$)'; }
    if(empty($_POST['D1'])){ $d1 = ""; } else { $d1 = '(^|,)D1(,|$)'; }
    if(empty($_POST['D1E'])){ $d1e = ""; } else { $d1e = '(^|,)D1E(,|$)'; }
    if(empty($_POST['D'])){ $d = ""; } else { $d = '(^|,)D(,|$)'; }
    if(empty($_POST['DE'])){ $de = ""; } else { $de = '(^|,)DE(,|$)'; }
    if(empty($_POST['T'])){ $t = ""; } else { $t = '(^|,)T(,|$)'; }

    if(empty($_POST['tachograf'])){ $tachograf = "%";}
    elseif($_POST['tachograf'] === "none") { $tachograf = "%";}
    elseif($_POST['tachograf'] === "Platná") { $tachograf = "%Platná%";}
    elseif($_POST['tachograf'] === "Nie"){ $tachograf = "%Nie%";}

    if(empty($_POST['prehliadka'])){ $prehliadka = "%";}
    elseif($_POST['prehliadka'] === "none"){ $prehliadka = "%";}
    elseif($_POST['prehliadka'] === "Platná") { $prehliadka = "%Platná%";}
    elseif($_POST['prehliadka'] === "Nie") { $prehliadka = "%Nie%";}

    if(empty($_POST['kv_karta'])) { $kv_karta = "%";}
    elseif($_POST['kv_karta'] === "none") { $kv_karta = "%";}
    elseif($_POST['kv_karta'] === "Platná") { $kv_karta = "Platná";}
    elseif($_POST['kv_karta'] === "Nie") { $kv_karta = "Nie";}

    if(empty($_POST['psychotesty'])) { $psychotesty = "%";}
    elseif($_POST['psychotesty'] === "none") { $psychotesty = "%";}
    elseif($_POST['psychotesty'] === "Platné") { $psychotesty = "Platné";}
    elseif($_POST['psychotesty'] === "Nie") { $psychotesty = "Nie";}
 
    if(empty($_POST['uvazok'])) { $uvazok = "%";}
    elseif($_POST['uvazok'] === "none") { $uvazok = "%";}
    elseif($_POST['uvazok'] === "Zivnost") { $uvazok = "Zivnost";}
    elseif($_POST['uvazok'] === "Skrateny uväzok") { $uvazok = "Skrateny uväzok";}
    elseif($_POST['uvazok'] === "Trvaly pomer") { $uvazok = "Trvaly pomer";}

    if(empty($_POST['nocna'])) { $nocna = "%";}
    elseif($_POST['nocna'] === "none") { $nocna = "%";}
    elseif($_POST['nocna'] === "Ano") { $nocna = "Áno";}
    elseif($_POST['nocna'] === "Nie"){$nocna = "Nie";}

    if(empty($_POST['mimo'])){$mimo = "%";}
    elseif($_POST['mimo'] === "none"){$mimo = "%";}
    elseif($_POST['mimo'] === "Ano"){$mimo = "Áno";}
    elseif($_POST['mimo'] === "Nie"){$mimo = "Nie";}

// Define database connection parameters
$db_host = "localhost";
$db_name = "vodici";
$db_user = "root";
$db_pass = "";


// Create a connection to the MySQL database using PDO
$pdo = new pdo(
    "mysql:host={$db_host};dbname={$db_name}",
    $db_user,
    $db_pass,
    [
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_EMULATE_PREPARES => FALSE
    ]
);


    $sql  = "
    SELECT * FROM users 
    WHERE vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND vodicaky REGEXP ?
        AND karta_vodica LIKE ?
        AND lekarska_prehliadka LIKE ?
        AND klasifikacna_karta LIKE ?
        AND psycho_testy LIKE ?
        AND pomer LIKE ?
        AND nocna LIKE ?
        AND cestovanie LIKE ?
    ";
    $query = $pdo->prepare($sql);
    echo $kv_karta, $psychotesty, $uvazok, $nocna, $mimo; 
    // Using `?` as placeholders in the SQL means we can pass an array of parameters
    // to the `execute` method and they will be applied to the query in the order they
    // appear. I.e. the first value in the array is mapped to the first `?` in the SQL
    $query->execute([$a1,$a2,$a,$b1,$b,$be,$c1,$c1e,$c,$ce,$d1,$d1e,$d,$de,$t,$tachograf,$prehliadka,
    $kv_karta,$psychotesty,$uvazok,$nocna,$mimo]);
    $post_count = $query->rowCount();
    $result = "";
    if($post_count > 0){
        while($row = $query->fetch(PDO::FETCH_ASSOC)){
            $num = "(".$post_count.")";
            $div = "<div style='border: 1px solid black; border-radius: 5px; margin-bottom:2%' class='row'>";
            $col1 = "<div style='border: 1px 0px 0px 0px solid black; padding: 1%; ' class'col-sm-12 col-md-6 col-lg-6'>";
            $vysledok = "<h2 style='text-decoration: underline; padding-left: 2%;'>".$row['meno']."  ".$row['priezvisko']."</h2>";
            $mail = "<p style='padding-left : 2%; font-size: 11px;'><strong>Rok narodenia:</strong> ".$row['rok_narodenia']." <br><strong>E-mail: </strong> ".$row['email']."</p>";
            $mesto = "<p style='padding-left: 2%'><strong>Mesto:</strong> ".$row['mesto']." <strong>Kraj:</strong> ".$row['kraj']."</p>";            
            $div_end = "</div>";
            $result .= $div. $col1. $vysledok. $mail.$mesto. $div_end. $col1. $div_end. $div_end ;
        }
    } else {
        $error = "Vašemu vyhľadávaniu nezodpovedá žiaden vodič";
        echo $error;
    }
    
    

      

$db = null; 
}
?>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="styles/style.css">
    <title>Vodici.emtea</title>
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    <script src='https://kit.fontawesome.com/a076d05399.js'></script>
</head>

<body>
    <div class="container">
        <header class="col-sm-0" style="background-color: #256F5B; margin-bottom: 5%;">
            <nav class="navbar navbar-light navbar-1 ">
                <a style="color: white" class="navbar-brand" href="index.php"><img src="images/logo.png" width="90" height="90"
                        alt="logo-here">Hľadáme prácu vodičom...</a>
            </nav>
        </header>
    </div>
    <div class="container">
        <div class="row">
            <div class="col-sm-12 col-md-3 col-lg-2 ">
                <div class="left-menu">
                    <div class="menu-left">Registrovaní vodiči</div>
                    <div class="list">
                        <form class="search-form" action="results.php" method="post">
                            <button style="border: 0; background: transparent; cursor: pointer;" type="submit" name="bratislava"><p>Bratislavský kraj<strong>(112)</strong></p></a>
                            <button style="border: 0; background: transparent; cursor: pointer;" type="submit" class="side-btn" name="trnava"><p>Trnavský kraj<strong>(90)</strong></p></button>
                            <button style="border: 0; background: transparent; cursor: pointer;" type="submit" class="side-btn" name="trencin"><p>Trenčianský kraj<strong>(72)</strong></p></button>
                            <button style="border: 0; background: transparent; cursor: pointer;" type="submit" class="side-btn" name="nitra"><p>Nitrianský kraj<strong>(11)</strong></p></button>
                            <button style="border: 0; background: transparent; cursor: pointer;" type="submit" class="side-btn" name="zilina"><p>Žilinský kraj<strong>(28)</strong></p></button>
                            <button style="border: 0; background: transparent; cursor: pointer;" type="submit" class="side-btn" name="bystrica"><p>Banskobystrický kraj<strong>(112)</strong></p></button>
                            <button style="border: 0; background: transparent; cursor: pointer;" type="submit" class="side-btn" name="presov"><p>Prešovský kraj<strong>(62)</strong></p></button>
                            <button style="border: 0; background: transparent; cursor: pointer;" type="submit" class="side-btn" name="kosice"><p>Košický kraj<strong>(89)</strong></p></button>
                        </form>
                        <script type="text/javascript">
                        function hide_r(){
                            document.getElementById('heading_r').style.display='none';
                            document.getElementById('r_btn').style.display='none';
                        }
                    </script>
                    </div>
                </div>
            </div>
            <div style="padding-bottom: 20%" class="col-sm-12 col-md-9 col-lg-10">
                <div class="main">
                    <div class="results">
                        <h5>Vyhľadajte vodičov podľa vaších predstáv...</h5>
                        <p>Nájdených výsledkov: <strong><?php if($post_count > 0) {echo $num;} else {echo 0;} ?></strong></p>
                        <hr>
                        <p><?php if(isset($_POST['submit']) && $error == "") {echo $result;}?></p>
                        <p><?php if(isset($_POST['submit']) && $error !== "") {echo $error;}?></p>
                    </div>
                </div>
            </div>
        </div>
    </div>
</body>
</html>