如何根据php中的下拉输入调用用户定义的函数?

I'm new with php.I have written a function fill_data($tagindex) now I want to call filldata(0); Input from a html form is a dropdownlist with AI-Types. I want it work like if i select AI-Type as eg.DTP4 then fill_data(0);fill_data(1);fill_data(2); should be called as result will be displayed accordingly. My question is that how can i do it? Can anybody help??plz.. Below is my so far tried code..

project.php

 function fill_data($tagindex)
              {
                   $fromdate=$_POST['fromdate'];
                   $todate=$_POST['todate'];
                   $fromtime=$_POST['fromtime'];
                   $totime=$_POST['totime'];
              // Create connection
              $conn = mysqli_connect('localhost', 'root', '','test');
             // Check connection
               if (!$conn) 
                {
                 die("Connection failed: " . mysqli_connect_error());
                }

                $sql ="SELECT * FROM floattable WHERE TagIndex=$tagindex AND (DateAndTime between '$fromdate .'  '. $fromtime' AND '$todate .'  '. $totime') ORDER BY DateAndTime ASC;";

                $result = mysqli_query($conn, $sql) or die(mysqli_error($conn));
            try{
                 
                 //for IP
                    if  (($tagindex=0)||($tagindex=1)||($tagindex=2)||($tagindex=3)||($tagindex=4)||($tagindex=5)||($tagindex=6)||($tagindex=7)||($tagindex=8)||($tagindex=10)||($tagindex=11)||($tagindex=12)||($tagindex=13)||($tagindex=14)||($tagindex=14)||($tagindex=15)||
                        ($tagindex=16)||($tagindex=17)||($tagindex=18)||($tagindex=19)||($tagindex=20)||($tagindex=21)||($tagindex=22)||($tagindex=23)||($tagindex=24)||($tagindex=25)||($tagindex=26)||($tagindex=27)||($tagindex=28)||($tagindex=29)||($tagindex=30)||($tagindex=31)||($tagindex=32)||
                        ($tagindex=33)||($tagindex=34)||($tagindex=35)||($tagindex=36)||($tagindex=37)||($tagindex=38)||($tagindex=39)||($tagindex=40))
                        {
                        // to display output
                        echo "<table border='1' cellspacing='3' align='centre'>
                          <tr>
                          <th>DateAndTime</th>
                          <th>Millitm</th>
                          <th>TagIndex</th>
                          <th>Value</th>
                          <th>Status</th>
                          <th>Market</th>
                          </tr>";

                              while ($row = mysqli_fetch_array($result)) 
                            {
                             echo " <tr>
                             <td>".$row['DateAndTime']."</td>
                             <td>".$row['Millitm']."</td>
                              <td>".$row['TagIndex']."</td>
                               <td>".$row['Val']."</td>
                                <td>".$row['Status']."</td>
                                 <td>".$row['Marker']."</td>
                             </tr>";
                            }
                                      echo "</table>";
                        }
                          

                   }
                         catch (Exception $e)
                         {
                             echo $e->getmessage();
                             exit(1);
                         }
                  mysqli_close($conn);
            
                }//End-of Fill_data Function            

if(isset($_POST["submit"]))
    {
    
    $selected = $_POST['AI-Types'];


  if('what condition i should write here so that below three calls will be executed')
                        fill_data(0);
                        fill_data(1);
                        fill_data(2);
     // FT1,FT2 are the inputs from the dropdownlist in html

//i want it work like if i select FT1 call to fill_data(2); should be executed
//dont think of $currentsheet it is just variable it can be removed
                        $currentSheet = "FT1";
                        fill_data(3);
                       
                        $currentSheet = "FT2";
                        fill_data(4);
                        
                        $currentSheet = "FT3";
                        fill_data(5);
                        fill_data(6);

                        $currentSheet = "LT1";
                        fill_data(7);
                       
                       $currentSheet = "LT2";
                        fill_data(8);
                        fill_data(9);
                        //

</div>