//////////////////////////////////////////////////
// html
//////////////////////////////////////////////////

                <form role="form" enctype="multipart/form-data" id="formHook" class="form-inline mb-3">
                    <div class="form-group mr-3">
                        <label for="formHookName" class="sr-only">Имя</label>
                        <input type="text" class="rounded-0 form-control" id="formHookName" placeholder="Имя">
                    </div>
                    <div class="form-group mr-3">
                        <label for="formHookPhone" class="sr-only">Телефон</label>
                        <input type="phone" class="rounded-0 form-control" id="formHookPhone" placeholder="Телефон">
                    </div>
                    <div class="form-group mr-3">
                        <label for="formHookFile" class="sr-only">Фаил</label>
                        <input type="file" class="rounded-0 form-control" id="formHookFile" placeholder="Документ">
                    </div>
                    <button type="submit" id="formHookSubmit" class="rounded-0 btn btn-primary ">Заказать</button>
                </form>

//////////////////////////////////////////////////
// js
//////////////////////////////////////////////////

$('#formHook').submit(function(event){
    // cancels the form submission
    event.preventDefault();
    submitHook();
});

function submitHook(){
    // Initiate Variables With Form Content
    var name = $('#formHookName').val();
    var phone = $('#formHookPhone').val();

    $.ajax({
        type: 'POST',
        url: '../media/php/mailHook.php',
        data:
        '&name=' + name +
        '&phone=' + phone,
        success : function(text){
            if (text == 'success'){
                successHook();
            }
        }
    });
}
function successHook(){
    $( '#formHookSubmit' ).text('Ждите звонка');
    $( '#formHookSubmit' ).prop( 'disabled', true );
}

//////////////////////////////////////////////////
// PHP
//////////////////////////////////////////////////

<?php

$name = $_POST["name"];
$phone = $_POST["phone"];

$EmailTo = "renat1771@gmail.com";
$email   = "noreply@yoursite.com";
$Subject = "New Hook Received From site";
$Headers = "Content-Type: text/html; charset=utf-8\r\n" . 'From: Site message <'.$email.'>' . "\r\n" . 'Reply-To: ' . $email;

// prepare email body text
$Body .= "Name: ";
$Body .= $name;
$Body .= "<br/>";

$Body .= "Phone: ";
$Body .= $phone;
$Body .= "<br/>";

// send email
$success = mail($EmailTo, $Subject, $Body, $Headers);

// redirect to success page
if ($success){
   echo "success";
}else{
    echo "invalid";
};
?>