gestion cookie et fct serialize

<?php
header("Access-Control-Allow-Origin: http://test3.local");
//header("Access-Control-Allow-Origin: http://test4.local");
//header("Access-Control-Allow-Origin: http://testnico.local");
//header("Access-Control-Allow-Origin: http://wordpress.local");
header("Access-Control-Allow-Credentials: true");


if(!isset($_COOKIE['Compteur'])){
    $cookiesvalue = 1;
}else{

    $unserialise = unserialize($_COOKIE['Compteur']);
    $cookiesvalue = $unserialise['compteur'];
}
$today = getdate();
$aujourdhui['annee']= $today['year'];
$aujourdhui['mois']= $today['mon'];
$aujourdhui['jour']= $today['mday'];
$aujourdhui['heure']= $today['hours'];
$aujourdhui['minutes']= $today['minutes'];
$aujourdhui['compteur']= $cookiesvalue + 1 ;
$serialize=serialize($aujourdhui);
setcookie("Compteur", $serialize);

try {

    $bdd = new PDO('mysql:host=localhost;dbname=base_test_modal;charset=utf8', 'root', '');
    $bdd->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch (Exception $e) {
    echo "erreur";
}

$texteBody = $bdd->query('SELECT `text_modal` FROM `modal` JOIN `client` ON `modal`.`id` = `client`.`id_text_modal` WHERE `domain` = "'.$_SERVER['HTTP_REFERER'].'"');
$donnee=$texteBody->fetch();

if (isset($_COOKIE['Compteur'])){
if ($aujourdhui['minutes'] <= $unserialise['minutes'] + 1)
{

if ($cookiesvalue < 5){
?>
<button type="button" id="btnmodal" class="btn btn-info btn-lg" data-toggle="modal" data-target="#exampleModalCenter">
    Open Modal <?php if ($cookiesvalue == null) {
        echo "1";
    } else {
        echo $cookiesvalue;
    } ?></button>
<div class="modal fade" id="exampleModalCenter" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle"
     aria-hidden="true">
    <div class="modal-dialog modal-dialog-centered" role="document">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title" id="exampleModalLongTitle">Modal Title</h5>
                <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span>
                </button>
            </div>
            <div class="modal-body">
                <?php
                echo $donnee["text_modal"];
                ?>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
            </div>
        </div>
    </div>
    <?php
    }
    } else {

        echo "compteur depassé";
        if (isset($_COOKIE['Compteur'])) {
            unset($_COOKIE['Compteur']);
            setcookie('Compteur', null, -1, '/');
        }
    }
    }else{ ?>
    <button type="button" id="btnmodal" class="btn btn-info btn-lg" data-toggle="modal" data-target="#exampleModalCenter">
    Open Modal 1
   </button>
    <div class="modal fade" id="exampleModalCenter" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle"
         aria-hidden="true">
        <div class="modal-dialog modal-dialog-centered" role="document">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title" id="exampleModalLongTitle">Modal Title</h5>
                    <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span>
                    </button>
                </div>
                <div class="modal-body">
                    <?php
                    echo $donnee["text_modal"];
                    ?>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
                </div>
            </div>
        </div>
   <?php
    }
    ?>