php export data to cvs - php

Question

I need a help exporting search query by clicking on export button. I am able to get data from database to the browser. However, when I click on export button, it refreshes the page, and doesnt do anything.
I am new to php and and programming. Any help will be appreciated :)
<?php
include('dbcon.php');
?>
<form id="searchform" action="index.php" method="post">
<table>
<tr>
<td class="searchleftcol"><h3>Service:</h3></td>
<td>
<select id="service" name="service" class="searchoption">
<option value="">-- Select Service Name --</option>
<?php
$resultservice = mysqli_query($con,"Select * from services") ?>
<?php
while ($line = mysqli_fetch_array($resultservice)) {
?>
<option value="<?php echo $line['serviceid'];?>"> <?php echo $line['service'];?> </option>
<?php
}
?>
</select>
</td>
</tr>
<tr>
<td>
<h3>Environment:</h3>
</td>
<td>
<select id="environment" name="environment" class="searchoption">
<option value="">-- Select Environment --</option>
<?php
$resultdomain = mysqli_query($con,"Select * from evn") ?>
<?php
while ($line = mysqli_fetch_array($resultdomain)) {
?>
<option value="<?php echo $line['envid'];?>"> <?php echo $line['env'];?> </option>
<?php
}
?>
</select>
</td>
</tr>
<tr>
<td>
<h3>Status:</h3>
</td>
<td>
<select name="status" class="searchoption">
<option value="Active">Active</option>
<option value="Inactive">Inactive</option>
</select>
</td>
</tr>
</table>
<input type="reset" name="reset">
<input type="submit" name="submit" value="Search">
<input type="submit" name="export" value="Export" />
</ul>
</form>
<?php
if (isset($_POST['submit'])) {
if (empty($_POST['service'])) {
echo "Please select service in dropdown" . "</br>";
}
else {
$service = $_POST['service'];
}
if (empty($_POST['environment'])) {
echo "Please select Environment in dropdown" . "</br>";
}
else {
$env = $_POST['environment'];
}
if ((!empty($service)) && (!empty($env))) {
$sql="SELECT * from servers";
if (!mysqli_query($con,$sql)) {
die('Error: ' . mysqli_error($con));
}
$mydata = mysqli_query($con,$sql);
$rowcount = mysqli_num_rows($mydata);
// Here I erased code that displays data from MySQL.
if (isset($_POST['export'])) {
if (empty($_POST['service'])) {
echo "Please select service in dropdown" . "</br>";
}
else {
$service = $_POST['service'];
}
if (empty($_POST['environment'])) {
echo "Please select Environment in dropdown" . "</br>";
}
else {
$env = $_POST['environment'];
}
if ((!empty($service)) && (!empty($env))) {
$sql="SELECT * from servers";
if (!mysqli_query($con,$sql)) {
die('Error: ' . mysqli_error($con));
}
$mydata = mysqli_query($con,$sql);
$rowcount = mysqli_num_rows($mydata);
//Programetically get the Headings of the excel columns
$columns_total = mysqli_num_fields($sql);
for ($i = 0; $i < $columns_total; $i++) {
$heading = mysql_field_name($sql, $i);
$contents .= '"'.$heading.'",';
}
$contents .="\n";
// Get Records from the table
while ($row = mysqli_fetch_array($sql)) {
for ($i = 0; $i < $columns_total; $i++) {
$contents.='"'.$row["$i"].'",';
}
$contents.="\n";
}
// Remove html and php tags etc.
$contents = strip_tags($contents);
//header to make force download the file
Header("Content-Disposition: attachment; filename=ProductsReport".date('d-m-Y').".csv");
print $contents;
}
}
mysqli_close($con);
}
?>}
Thanks,
Ray