PHP

require_once 'connect.php'; 
  //$_GET[id]

error_reporting(E_ALL);
ini_set('display_errors', 'On');
ini_set('html_errors', 'On');

if (isset($_REQUEST['id'])) {
	
$result= mysqli_query($dbconnect, "SELECT * FROM mart.file_conference21 WHERE id='$_GET[id]'");
$row = mysqli_fetch_array($result);

//$row['date']='';
//var_dump(array_keys($row)); exit();

header("Content-Length: $row[size]");
header("Content-type: $row[type]");
header("Content-Disposition: attachment; filename=$row[name]");
echo $row[data];
exit();
}

?>

Файлы из БД:

<?php

$result= mysqli_query($dbconnect, "SELECT * FROM mart.file_conference21 ORDER BY ID desc" )or die("SELECT Error: ".mysqli_error()); 
 
echo "<ul>";

while($row = mysqli_fetch_array($result)){

//$str = base64_decode($row[body]);

print "<li><a href=\"dwnld.php/?id=$row[id]\">$row[name]</a></li>";
}

echo "</ul>";

?>