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Start your free trialJonathan Grieve
Treehouse Moderator 91,253 Points[SOLVED] Catalog.php is causing chrome to redirect too many times
Hi everyone.
Okay so there's a problem with my catalog.php pages. I've followed the video as best as I can and it seems to be sending the pagination variables but causing redirects.
Can someone with a keener eye than me spot the issue? :)
I've posted the code below and also a link to a Workspace Snaphot. https://w.trhou.se/dqjd7g3u64
<?php
include("inc/functions.php");
$pageTitle = "Full Catalog";
$section = null;
$total_pages = ceil($total_items / $items_per_page);
//limit results in redirect
$limit_results = "";
if (!empty($section)) {
$limit_results = "cat=" . $section . "&";
}
// redirect too-large page numbers to the last page
if ($current_page > $total_pages) {
header("location:catalog.php?"
. $limit_results
. "pg=".$total_pages);
}
// redirect too-small page numbers to the first page
if ($current_page < 1) {
header("location:catalog.php?"
. $limit_results
. "pg=1");
}
//determine the offset (number of items to skip) for the current page
//for example: on page 3 with 8 item per page, the offset would be 16
$offset = ($current_page - 1) * $items_per_page;
if (isset($_GET["cat"])) {
if ($_GET["cat"] == "books") {
$pageTitle = "Books";
$section = "books";
} else if ($_GET["cat"] == "movies") {
$pageTitle = "Movies";
$section = "movies";
} else if ($_GET["cat"] == "music") {
$pageTitle = "Music";
$section = "music";
}
}
$catalog = full_catalog_array(); //include catalog array
if(empty($section)) {
$catalog = full_catalog_array($items_per_page, $offset);
} else {
$catalog = category_catalog_array($section, $items_per_page, $offset);
}
include("inc/header.php"); ?>
<div class="section catalog page">
<div class="wrapper">
<h1><?php
if ($section != null) {
echo "<a href='catalog.php'>Full Catalog</a> > ";
}
echo $pageTitle; ?></h1>
<ul class="items">
<?php
foreach ($catalog as $item) {
echo get_item_html($item);
}
?>
</ul>
</div>
</div>
<?php include("inc/footer.php"); ?>
<?php
function get_item_html($item) {
$output = "<li><a href='details.php?id="
. $item["media_id"] . "'><img src='"
. $item["img"] . "' alt='"
. $item["title"] . "' />"
. "<p>View Details</p>"
. "</a></li>";
return $output;
}
function array_category($catalog,$category) {
$output = array();
foreach ($catalog as $id => $item) {
if ($category == null OR strtolower($category) == strtolower($item["category"])) {
$sort = $item["title"];
$sort = ltrim($sort,"The ");
$sort = ltrim($sort,"A ");
$sort = ltrim($sort,"An ");
$output[$id] = $sort;
}
}
asort($output);
return array_keys($output);
}
function full_catalog_array($limit = null, $offset = 0) {
include("connection.php");
try {
$sql = "
SELECT media_id, title, category, img
FROM Media
ORDER BY
REPLACE(
REPLACE(
REPLACE(title,'The ',''),
'An ',
''
),
'A ',
'')";
if (is_integer($limit)) {
$results = $db->prepare($sql . " LIMIT ? OFFSET ?");
$results->bindParam(1,$limit,PDO::PARAM_INT);
$results->bindParam(2,$offset,PDO::PARAM_INT);
} else {
$results = $db->prepare($sql);
}
$results->execute();
//echo "Retrieved Results: ";
} catch (Exception $e) {
echo "Unable to retrieve results: ";
echo $e->getMessage();
exit;
}
$catalog = $results->fetchAll(PDO::FETCH_ASSOC);
return $catalog;
}
function get_catalog_count($category = null) {
$category = strtolower($category);
include("connection.php");
try {
$sql = "SELECT COUNT(media_id) FROM Media";
if (!empty($category)) {
$result = $db->prepare(
$sql
. " WHERE LOWER(category) = ?"
);
$result->bindParam(1,$category,PDO::PARAM_STR);
} else {
$result = $db->prepare($sql);
}
$result->execute();
} catch (Exception $e) {
echo "bad query";
}
$count = $result->fetchColumn(0);
return $count;
}
function random_catalog_array() {
include("connection.php");
try {
$results = $db->query(
"SELECT media_id, title, category, img
FROM Media
ORDER BY RANDOM()
LIMIT 4"
);
} catch (Exception $e) {
echo "Unable to retrieved results";
exit;
}
$catalog = $results->fetchAll();
return $catalog;
}
function category_catalog_array($category, $limit = null, $offset = 0) {
include("connection.php");
$category = strtolower($category);
try {
$sql = "SELECT media_id, title, category,img
FROM Media
WHERE LOWER(category) = ?
ORDER BY
REPLACE(
REPLACE(
REPLACE(title,'The ',''),
'An ',
''
),
'A ',
''
)";
if (is_integer($limit)) {
$results = $db->prepare($sql . " LIMIT ? OFFSET ?");
$results->bindParam(1,$category,PDO::PARAM_STR);
$results->bindParam(2,$limit,PDO::PARAM_INT);
$results->bindParam(3,$offset,PDO::PARAM_INT);
} else {
$results = $db->prepare($sql);
$results->bindParam(1,$category,PDO::PARAM_STR);
}
$results->execute();
} catch (Exception $e) {
echo "Unable to retrieved results";
exit;
}
$catalog = $results->fetchAll();
return $catalog;
}
function single_item_array($id) {
include("connection.php");
try {
$results = $db->prepare("
SELECT title, category, img, format, year, publisher, isbn, genre
FROM Media
JOIN Genres ON Media.genre_id = Genres.genre_id
LEFT OUTER JOIN Books
ON Media.media_id = Books.media_id
WHERE Media.media_id = ?"
);
$results->bindParam(1, $id, PDO::PARAM_INT);
$results->execute();
//echo "Retrieved Results: ";
} catch (Exception $e) {
echo "Unable to retrieve results: ";
echo $e->getMessage();
exit;
}
$item = $results->fetch(PDO::FETCH_ASSOC);
if(empty($item)) return $item; //item return item - an early return
try {
$results = $db->prepare("
SELECT fullname, role
FROM Media_People
JOIN People ON Media_People.people_id = People.people_id
WHERE Media_People.media_id = ?"
);
$results->bindParam(1, $id, PDO::PARAM_INT);
$results->execute();
//echo "Retrieved Results: ";
} catch (Exception $e) {
echo "Unable to retrieve results: ";
echo $e->getMessage();
exit;
}
while($row = $results->fetch(PDO::FETCH_ASSOC)) {
$item[$row["role"]][] = $row["fullname"];
}
return $item; ///
}
Jonathan Grieve
Treehouse Moderator 91,253 PointsJonathan Grieve
Treehouse Moderator 91,253 PointsProblem Solved.
I needed one more piece of code I forgot to include from a previous video. I managed to get the code over to my server which indicated the problem was a division by zero because $items_per_page variable wasn't initialised.