save jquery value with php

i have form like this

<div id="signUp" class="form-inline">
   <div class="form-group">
      <label for="">I Sign up as</label>
      <input id="placehold" type="text" class="form-control text-center" readonly/>
      <div class="smallspace"></div>
      <div class="displayTable">
         <div class="radio-inline">
            <input type="radio" class="radio_item" value="Company"  name="item" id="radioCompany">
            <label class="label_item" for="radioCompany"></label>
            <p class="text-center colorGrey">Company</p>
         </div>
         <div class="radio-inline">
            <input type="radio" class="radio_item" value="Chef"  name="item" id="radioChef">
            <label class="label_item" for="radioChef"></label>
            <p class="text-center colorGrey">Chef</p>
         </div>
         <div class="radio-inline">
            <input type="radio" class="radio_item" value="Food lover" name="item" id="radioFoodLover">
            <label class="label_item" for="radioFoodLover"></label>
            <p class="text-center colorGrey">Food lover</p>
         </div>
      </div>
   </div>
</div>
<script src="js/upload.js"></script>

inside upload js i code like this

(function($) {
    "use strict";

    // register
    $(document).ready(function() {

        $('#signUp input').on('change', function() {
            var signUp = $(this).val();
            $("#placehold").val(signUp);//show value of chosen radio button to input text
        });
    });

})(jQuery);

summary this code is, i have input text(readonly) and 2 radio button, when we choose the radio button then system will get the value of the choosen than show it to the input type text.

the reason i put the validation to other file because honestly it got so much validation, for another input too. i just didnt like it if i have to place the validation inside html file.

my question is: is it posible to get that value and store it to database via PHP?