PHP - Keeping Footer At Bottom Of Page

HTML
<div id="parent">
      <div id="bottom_element">test</div>
</div>


CSS
#parent {height:100% width:100%}
#bottom_element {position:absolute; bottom:5px; width:200px; margin:0 auto}

Hi All,

I am a newbie to php and I have this issue. I would appreciate if anyone can help out. I tried a few things but was not able to come up with a solution.

From reading few codes and learning from it, I created this function in query.php and am calling this function in uk.php file, but the problem is that it loads and shows the data in table, but then it stops loading page from there on and the footer which is in html code after the place where I am calling this function does not load.

I tried removing return false; command, but with that it loads the footer, but it shows the table after the footer.

I want the table with data to show in between header and footer.

Can you guys let me know what I need to do to achieve that?

File Name: query.php

function uk()
{
	$output = '';
	$result = db_query("SELECT * FROM lecture where groups='uk'");

	if(mysqli_num_rows($result) > 0)
	{
		$output .= '<div id="style2" style="overflow-x:auto;">
						<table>
							<tr>
								<th class="text-center">Date</th>
								<th class="text-center">Title</th>
								<th class="text-center">Venue</th>
								<th class="text-center">Duration</th>
								<th class="text-center">Size (MB)</th>
								<th class="text-center">Link</th>
							</tr>';
		while($row = mysqli_fetch_array($result))
		{
			$output .= '
				<tr>
					<td>'.$row["mydate"].'</td>
					<td>'.$row["title"].'</td>
					<td>'.$row["venue"].'</td>
					<td>'.$row["duration"].'</td>
					<td>'.$row["size"].'</td>
					<td><a href="../'.$row["path"].$row["file_name"].'">Save</a></td>
				</tr>
			';
		}
		echo $output;
	}
	else
	{
		echo 'Data Not Found';
	}
}

File Name: uk.php

Header html code here

Some body text

<?php
include '../includes/query.php';
uk();
return false;
?>

Footer html code here

I need to create the unique SKU (Stock Keeping Unit) name for each products mixed with
product.id,product.name,product.category and product.brand. There is no problem to do it,

i.e.: SKU for a product with

id=13,
name=Bio Clean green and
category=INSECTS KILLERS
brand=HARPIC

becomes : BI-IKHA0013

This is how I tried:

$inm = "Bio Clean green500ml";
$cnm = "INSECTS KILLERS";
$bnm = "HARPIC ";

echo SKU_gen($inm, $cnm,$bnm,20).'<br>';


function SKU_gen($pname, $cat=null, $brand=null, $id = null, $l = 2){
    $results = ''; // empty string

    $str1 = array_shift(explode(' ',$pname));
    $str1 = strtoupper(substr($str1, 0, $l));

    $str2 = array_shift(explode(' ',$cat));
    $str2 = strtoupper(substr($str2, 0, $l));

    $str3 = array_shift(explode(' ',$brand));
    $str3 = strtoupper(substr($str3, 0, $l));

    $id = str_pad($id , 4, 0, STR_PAD_LEFT);

    $results .= "{$str1}-{$str2}{$str3}{$id}";
    return $results;
}

But this function is not working as expected when category of brand values become NULL.