RewriteEngine On
RewriteRule ^([0-9a-zA-Z-]+)(/?)$ bayii-detay.php?bayi_sef=$1 [QSA]

function closeAlert(n){
    n == 1 ?
    document.querySelector('.alert-success').classList.remove('alert-show')
    :
    document.querySelector('.alert-danger').classList.remove('alert-show');
}
function showAlert(n){
    if (n == 1) {
        document.querySelector('.alert-success').classList.add('alert-show'); // Söz dizimi hatası veren yer
        setTimeout(() => {
            closeAlert(1);
        },5000);
    } else {
        document.querySelector('.alert-danger').classList.add('alert-show');
        setTimeout(() => {
            closeAlert(2);
        },5000);
    }
}

<?php
// Bu gelen veri
$kullanicilar = array(
    array(
        "isim"   => "yusuf",
        "parola" => "123"
    )
);
foreach ($kullanicilar as $kullanici) {
    $db->query("INSERT INTO uyeler SET 
    kul_adi = '{$kullanici['isim']}', 
    sifre = '{$kullanici['parola']}' ");
}
?>