layer-8/app/db_connector.php

<?php
  $pdo;
  try {
	  $pdo = new PDO($dsn, $user, $passwd);
	  // if ($pdo) echo "Connected to the $dbname database successfully!";

  } catch (PDOException $e) {
	  echo $e->getMessage();
  }

function get_images($pdo, $search='%', $sort='img_date', $sdir='DESC') {
  $params = array('search' => $search, 'sort' => $sort, 'sdir' => $sdir);
  $stmt = $pdo->prepare("SELECT * FROM images WHERE img_title LIKE CONCAT('%', :search ,'%') ORDER BY :sort :sdir;");
  $stmt->execute($params);
  $data = $stmt->fetchAll();

  $img_list = '<ul class="img_list">';
  foreach ($data as $block) {
    $img_list .= '<li>';
    $img_list .= '<img src=\''.$block['img_path'].'\'><br>';
    $img_list .= '<h4>'.$block['img_title']."<br></h4>";
    $img_list .= '<p>'.$block['img_desc']."</p>";
    $img_list .= '</li>';
  }
  $img_list .= '</ul>';
  echo $img_list;
}