Юрий Воронин

<LocationMatch "/\.(?!well-known)">
    Require             all denied
</LocationMatch>

foreach ($_POST["WareKeyItem"] as $k => $item) {
                $sum += (int)$_POST["CostItem"][$k]*(int)$_POST["AmountItem"][$k];
            }

var formData = new FormData();
   $.each($('#file')[0].files, function(i, file) {
        formData.append('file', file);
   });
   formData.append('action', 'read_file');

$('form#f_job').submit(function(event){
            event.preventDefault();
            var formNm = $('#f_job')[0];
            var formData = new FormData(formNm);
            // отправляем данные
            $.ajax({
                url: "/mail.php",
                type: "post",
                data: formData,
                contentType: false,
                processData: false,
                success: function(data){
                    console.log(data);
                },
            });
        });