Андрей Ежгуров

document.addEventListener('DOMContentLoaded', function() {
    var mainNav = document.querySelector('.menu__body');
    window.onscroll = function() {
        mainNav.classList.toggle('test', mainNav.scrollTop > 50 || document.documentElement.scrollTop > 50);
    }
});

SELECT kz1.* FROM kz AS kz1
INNER JOIN kz AS kz2 ON kz1.kz_year = kz2.kz_year AND kz1.kz_pid = kz2.kz_pid
WHERE kz2.kz_id = 694

if (mysqli_query($link,"INSERT INTO users SET user_login='".$login."', user_password='".$password."'")) {
    header("Location: login.php");
    exit;
} else {
    var_dump(mysqli_error($link));
}

$s = '|1||2||3||7|9|';
echo implode(',', array_map(function ($v) { return ' qwertyuio'[$v]; }, preg_split('#\|+#', $s, -1, PREG_SPLIT_NO_EMPTY)));

STR_TO_DATE('05-09-2019 17:02:14', '%d-%m-%Y %H:%i:%s')

$("#sendzajav").submit(function (e) {
    e.preventDefault();

    var emailval = $("#email").val();
    var nameval = $("#name").val();
    var phoneval = $("#phone").val();

    if (ValidPhone(phoneval)) {
        $("#phone").removeClass("error");
    } else {
        $("#phone").addClass("error");
        return;
    }

    if (!inputlen(nameval.length, "name")) {
        return;
    }

    $("#sendzajav").val("Идет Отправка...");
    $.ajax({
        type: "POST",
        url: "mail.php",
        data: {"Имя": nameval, "Телефон": phoneval, "Почта": emailval}
    }).done(function () {
        alert("Спасибо за Вашу заявку!");
        setTimeout(function () {
            $('form').trigger("reset");
        }, 1000);
    });
});