function get_book_or_404()
{
$book = find_book_by_id(filter_var(params('id'), FILTER_VALIDATE_INT));
if (is_null($book)) {
halt(NOT_FOUND, "This book doesn't exist.");
}
return $book;
}
<?php
require_once "../includes/session.php";
require_once "../includes/db_connection.php";
require_once "../includes/functions.php";
confirm_logged_in();
?>
<?php
$current_book = find_book_by_id($_GET["book"], false);
if (!$current_book) {
// book ID was missing or invalid or
// book couldn't be found in database
redirect_to("manage_content.php");
}
$id = $current_book["id"];
$query = "DELETE FROM yb_books WHERE id = {$id} LIMIT 1";
$result = mysqli_query($connection, $query);
if ($result && mysqli_affected_rows($connection) == 1) {
// Success
$_SESSION["message"] = "book deleted.";
redirect_to("manage_content.php");
} else {
// Failure
$_SESSION["message"] = "book deletion failed.";
redirect_to("manage_content.php?book={$id}");
}
/**
* This will select data for the current book or current category
* @param
*/
function find_selected_book($public = false)
{
global $current_category;
global $current_book;
if (isset($_GET["category"])) {
$current_category = find_category_by_id($_GET["category"], $public);
if ($current_category && $public) {
$current_book = find_default_book_for_category($current_category["id"]);
} else {
$current_book = null;
}
} elseif (isset($_GET["book"])) {
$current_category = null;
$current_book = find_book_by_id($_GET["book"], $public);
} else {
$current_category = null;
$current_book = null;
}
}