php - Add two variables values in one variable with if else condition when data pass through ajax -

i want add 2 variables(class textbox , hiddentxtbox) values in 1 variable(check) using if else condition , want pass 1 variable(check)in ajax.i want if select database headers options firstname,lastname dropdown value pass through checkbox else textbox value pass through checkbox.in script have pass check variable this:- data: { check: textbox, oldval: textbox1,hiddentxtbox:hiddentxtbox,olddropval:textbox2} in above code check variable has 1 value textbox.i want if select database headers options firstname,lastname dropdown value pass through checkbox check:hiddentxtbox else check:textbox

<script>   $(document).ready(function(){     $('#submit').click(function(){      var  hiddentxtbox=[];     var textbox = [];     var textbox1 = [];     var textbox2= [];      var check = [];     $('.check').each(function() {       if ($(this).is(':checked')) {         var current = $(this).val();          //alert(current);         textbox.push($(this).parents("tr").find(".textbox").val())         textbox1.push($(this).parents("tr").find(".textbox1").val())         textbox2.push($(this).parents("tr").find(".textbox2").val())         hiddentxtbox.push($(this).parents("tr").find(".newhiddenbox").val())       }       check.push($(this).val());     });     $.ajax({       url: 'practice.php',       type: 'post',       data: {check: textbox, oldval: textbox1, hiddentxtbox: hiddentxtbox, olddropval: textbox2},       success: function (data) {           alert(data);       }     });     return false;   }); }); </script>        <table>          <tr>           <td>             <select name='drop[]' class='select_drop textbox textbox1 form-control'>               <option  value="firstname">firstname</option>               <optgroup label='newtextfields' class='txtfields' >                 <option value='text' >text</option>                 <option value='number'>number</option>               </optgroup>               <optgroup label='database headers'>                  <option value="firstname">firstname</option>                 <option value="lastname">lastname</option>                 <option value="email">email</option>                 }               </optgroup>           </td>            <td><input  type='hidden' value='firstname'  class='textbox2  form-control' id='textbox2'></td>           <td><input type='hidden' id='newhiddenbox' class='newhiddenbox' value='firstname'></td>           <td><input type='checkbox'  name='check' value='firstname' class='check checkbox-primary' >add column</td>            <br>           </select>         </tr>       </table>     </div>       <div class='form-group'>       <table>         <tr>           <td>             <select name='drop[]' class='drop  form-control' >               <optgroup selected label='newtextfields'>                 <option value='text'>text</option>                 <option value='number'>number</option>               </optgroup>               <optgroup label='database headers' class='hd'>                 <option value="firstname">firstname</option>                 <option value="lastname">lastname</option>                 <option value="email">email</option>               </optgroup>             </select>           </td>           <td><input  type='text' value='lastname'  class='textbox tt form-control' id='textbox'></td>           <td><input  type='hidden' value='lastname'  class='textbox1 form-control' id='textbox1'></td>           <td><input type='hidden' id='newhiddenbox'class='newhiddenbox' value='lastname'></td>             <td><input type='checkbox' name='check'  value='lastname' class='check checkbox-primary' style='margin-left:5px;'>add column</td>         </tr>       </table>     </div>   </div>  </div> <input type='submit' name='submit' id='submit' value='submit' >  </div>