private function processPhone($phone)
    {
        $hasPlus = $phone[0] == '+';

        $phone = preg_replace('/D+/', '', $phone);

        if($phone[0] == '8')
        {
            $phone = '7' . substr($phone, 1);
        }


        return trim($phone);
    }

preg_replace('~D~', '', $phone);

function maskPhone(selector, masked = '+7 (___) ___-__-__') {
        const elems = document.querySelectorAll(selector);

        function mask(event) {
            const keyCode = event.keyCode;
            const template = masked,
                def = template.replace(/D/g, ""),
                val = this.value.replace(/D/g, "");

            let i = 0,
                newValue = template.replace(/[_d]/g, function (a) {
                    return i < val.length ? val.charAt(i++) || def.charAt(i) : a;
                });
            i = newValue.indexOf("_");
            if (i !== -1) {
                newValue = newValue.slice(0, i);
            }
            let reg = template.substr(0, this.value.length).replace(/_+/g,
                function (a) {
                    return "\d{1," + a.length + "}";
                }).replace(/[+()]/g, "\$&");
            reg = new RegExp("^" + reg + "$");
            if (!reg.test(this.value) || this.value.length < 5 || keyCode > 47 && keyCode < 58) {
                this.value = newValue;
            }
            if (event.type === "blur" && this.value.length < 5) {
                this.value = "";
            }

        }

        for (const elem of elems) {
            elem.addEventListener("input", mask);
            elem.addEventListener("focus", mask);
            elem.addEventListener("blur", mask);
        }

    }
    maskPhone('input[type=tel]');

if ($('#phone_inp').val().length){
var ph = $('#phone_inp').val().replace(/[^0-9.]/g, "");
if(ph.length == 11) {

echo NormalizePhone("8 (2546) 27-27-10",14);
echo check_email("maxkuku@gmail.com");

$(document).ready(function(){

    // сли пользователь начинает вводить телефон с восьмерки она изменяется

    $('[name=user_f_5]').keyup(function (event) {
        if($('[name=user_f_5]').val().length === 4) {
            console.log('press')
            newText = event.target.value;
            $('[name=user_f_5]').val(newText.replace("8",""));
        }
    });
});

if($("[name=form_text_21]").val().replace(/D+/g, '').length == 11)