My ISSET post function is not working , can't pinpoint why

Question

I've been trying to get my isset post function to work, I don't think there are any typographical errors as I've checked multiple times now. Are there any ways where I can pinpoint as to why it isn't working? I've tried testing out my SQL insert query by hardcoding the data and it worked. However when I click the submit button after keying in the inputs on the form the page refreshes and the data doesn't go to the database. The search query is not working either. Therefore I deduced that the problem might be with my ISSET function. Below is the code if needed:

<?php
    // Load the required files
    require_once 'dbconfig.php';

    //connect to database
    $dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD,DB_NAME);
    //echo $_SESSION['email'];
    $id = "";
    $empid = "";
    $name = "";
    $entitlement = "";
    $date = "";
    $clinic = "";
    $type = "";
    $days = "";
    $currency = "";
    $paid = "";
    $rate = "";
    $claimed = "";
    $balance = "";
    $hospleave = "";
    $medleave = "";
    $remark = "";

function getEmployee()
{   
    $employee = array();
    $employee[0] = $_POST['empid'];
    $employee[1] = $_POST['name'];
        return $employee;
}

// get values from the form
function getPosts(){
    $posts = array();
    //$post[0] = $_POST['empid'];
    //$post[1] = $_POST['name'];
    $posts[2] = $_POST['entitlement'];
    $posts[3] = $_POST['date'];
    $posts[4] = $_POST['clinic'];
    $posts[5] = $_POST['type'];
    $posts[6] = $_POST['days'];
    $posts[7] = $_POST['currency'];
    $posts[8] = $_POST['paid'];
    $posts[9] = $_POST['rate'];
    $posts[10] = $_POST['claimed'];
    $posts[11] = $_POST['balance'];
    $posts[12] = $_POST['hospleave'];
    $posts[13] = $_POST['medleave'];
    $posts[14] = $_POST['remark'];
    return $posts;
}

// Search (drop downlist.)

if(isset($_POST['search']))
{
    $employee = getEmployee();

    $search_Query = "SELECT * FROM employees WHERE emp_id = '$employee[0]'";

    $search_Result = mysqli_query($dbc, $search_Query);

    if($search_Result)
    {
        if(mysqli_num_rows($search_Result))
        {
            while($row = mysqli_fetch_array($search_Result))
            {               
                $empid=$row['emp_id'];
                $name=$row['emp_fullname'];
            }
        }else{
            echo 'No Data For This Id';
        }
    }else{
        echo 'Result Error';
    } 
}

// Insert
if(isset($_POST['insert']))
{
    $employee = getEmployee();
    $data = getPosts();

    //Upload Image(receipt)

    //insert statement
    /*$insert_Query= ("INSERT INTO `medical`
                (`emp_id`,`emp_fullname`, `med_entitlement`, `med_date` ,
                `med_clinic`, `med_days`, `med_paid`, `med_currency`, 
                `med_rate`, `med_claimed`, `med_balance`,`hosp_leave`, 
                `med_leave`,`med_remark`) 
        VALUES ('$employee[0]', '$employee[1]', '$data[2]', '$data[3]', 
                '$data[4]', '$data[5]', '$data[6]', '$data[7]', 
                '$data[8]', '$data[9]', '$data[10]', 
                '$data[11]'),'$data[12]'),'$data[13]'),'$data[14]')");
    */
    $insert_Query="INSERT INTO `medical` 
                (`med_id`, `emp_id`, `emp_fullname`, `med_entitlement`, 
                `med_date`, `med_clinic`, `med_days`, `med_paid`, 
                `med_currency`, `med_rate`, `med_claimed`, `med_balance`, 
                `med_remark`, `med_leave`, `hosp_leave`, `med_type`) 
        VALUES ('$employee[0]', '$employee[1]', '$data[2]', '$data[3]', 
                '$data[4]', '$data[5]', '$data[6]', '$data[7]', 
                '$data[8]', '$data[9]', '$data[10]', 
                '$data[11]'),'$data[12]'),'$data[13]'),'$data[14]')";  
    $insert_Result = mysqli_query($dbc, $insert_Query);



    if($insert_Result){
        if(mysqli_affected_rows($dbc) > 0){
            echo 'Data Inserted';
        }else{
            echo 'Data Not Inserted';
        }

        header("Location: displaymed.php");//redirect to claimDisplay.php page
        mysqli_close( $dbc ) ;      
    }
}
?>
<div id="form">
<form action="medfee.php" method="post" name="myForm" onsubmit="return(validate());" enctype="multipart/form-data" >
      <table border=0 width='82%'>

            <tr><br><br>
            <td>Employee ID</td><td>:</td><td><input type="text" name="empid" maxlength="5" pattern="[A-Z]{3,5}" required title="Min.3, Max. 5 Capitial Letters ONLY!" ><td><input type="submit" name="search" value="Find"></td></td>
            <td>Amount Paid</td><td>:</td><td><input type="text"  name="paid"></td>
            </tr>

            <tr>
            <td>Full Name</td><td>:</td><td><input type="text" name="name"></td>
            <td></td>
            <td>Exchange Rate</td><td>:</td><td><input type="text" name="rate"></td>
            </tr>

            <tr>
            <td>Entitlement</td><td>:</td><td><input type="text" name="entitlement"></td>
            <td></td>
            <td>Amount Claimed (SGD)</td><td>:</td><td><input type="text" name="claimed" >
            </tr>

            <tr>
            <td>Date</td><td>:</td><td><input type="text" name="date" placeholder="DD-MM-YYYY"></td>
            <td></td>
            <td>Amount Balance (SGD)</td><td>:</td><td><input type="text" name="balance"></td>
            </tr>

            <tr>
            <td>Hospital / Clinic</td><td>:</td><td><input type="text" name="clinic"></td>
            <td></td>
            <td>Balance Hospital Leave</td><td>:</td><td><input type="text" name="hospleave"></td>
            </tr>

            <tr>
            <td>Medical Type</td><td>:</td><td><select name="type">
                <option selected></option>
                <option value="Medical Leave">Medical Leave</option>
                <option value="Outpatient Leave">Outpatient Leave</option>
                <option value="Hospitalization Leave">Hospitalization Leave</option>

                </select></td>
            <td></td>
            <td>Balance Medical Leave</td><td>:</td><td><input type="text" name="medleave"></td>
            </tr>

            <tr>
            <td>Utilized (Days)</td><td>:</td><td><input type="text" name="days"></td>
            <td></td>
            <td>Remarks</td><td>:</td><td><input type="text" name="remark"  style="height:50px; rows="2" cols="25"></td>
            </tr>
            <tr>
            <td>SGD / RM</td><td>:</td><td><input type="text" name="currency"></td>
            <td></td>
            </tr>

            <tr>
            <td></td>
            <td></td><td></td><td></td><td></td>
            <td align="right"><input type="submit" name="insert" value="Add"></td>
            </tr>   

            <tr>
            <td><br><br><br></td>
            <td></td>
            </tr>
        </table>
    </form>
</div>

Answer 1

Here are the typos in your $insert_Query ...

Change:

),'$data[12]'),'$data[13]')

To:

,'$data[12]','$data[13]'

So that your query looks like this:

$insert_Query="INSERT INTO `medical` 
                (`med_id`, `emp_id`, `emp_fullname`, `med_entitlement`, 
                `med_date`, `med_clinic`, `med_days`, `med_paid`, 
                `med_currency`, `med_rate`, `med_claimed`, `med_balance`, 
                `med_remark`, `med_leave`, `hosp_leave`, `med_type`) 
        VALUES ('$employee[0]', '$employee[1]', '$data[2]', '$data[3]', 
                '$data[4]', '$data[5]', '$data[6]', '$data[7]', 
                '$data[8]', '$data[9]', '$data[10]', 
                '$data[11]','$data[12]','$data[13]','$data[14]')";

Better still, you should be using mysqli prepared statements for security purposes. Research this topic as much as you can until you are comfortable with it. Start with this example: https://stackoverflow.com/a/2553892/2943403 then check the php manual and other snippets around the internet. This is time well spent.