Blog (Including Commenting) With Extra Posts Column
Posted: Sun May 25, 2014 8:59 pm
Hi, I'm pretty much a newbie to php and have followed the Blog (Including Commenting) tutorial on Youtube. I got it working with the files in http://betterphp.co.uk/board/viewtopic. ... 054&p=8298, yet I don't understand what the user did to get rid of the "Invalid post ID." error when accessing the blog_read.php directly. However, my main problem is I would like to add a dropmenu selection where the user can select a category so that I can then have pages based on those categories. There are no errors when I append error_reporting(E_ALL); ini_set('display_errors', 1); to connect.php. When I attempt to submit with the category choice there is no added row in the database and it is not apparent in blog_list.php. Tell me what I am missing. Thanks.
blog_list.php
blog_list.php
<?php
include('connect.php');
?>
<!DOCTYPE HTML>
<html lang="en" class="no-js">
<head>
<meta charset="UTF-8">
<title>SITENAME</title>
</head>
<body>
<div>
<?php
$posts = get_posts();
foreach ($posts as $post){
?>
<h2><a href="blog_read.php?pid=<?php echo $post['id']; ?>"><?php echo $post ['title']; ?></a></h2>
<h4>By <?php echo $post['user']; ?> on <?php echo $post['date']; ?></h4>
<h4>(<?php echo $post['total_comments']; ?> comments, last comment <?php echo $post['last_comment']; ?>)</h4>
<hr />
<p><?php echo $post['preview']; ?></p>
<?php
}
?>
</div>
</body>
</html>
blog_post.php
<?php
include('connect.php');
if (isset($_POST['user'], $_POST['category'], $_POST['title'], $_POST['body'])){
add_post($_POST['user'], $_POST['category'], $_POST['title'], $_POST['body']);
header('Location: blog_list.php');
die();
}
?>
<!DOCTYPE HTML>
<html lang="en" class="no-js">
<head>
<meta charset="UTF-8">
<title>SITENAME</title>
</head>
<body>
<form action="" method="post">
<p>
<label for="user">Name</label>
<input type="text" name="user" id="user" />
</p>
<p>
<label for="title">Title</label>
<input type="text" name="title" id="title" />
</p>
<p>
<label for="category">Category</label>
<select name="category" id="category">
<option value="Option1">Option1</option>
<option value="Option2">Option2</option>
<option value="Option3">Option3</option>
</select>
</p>
<p>
<textarea name="body" rows="20" cols="60"></textarea>
</p>
<p>
<input type="submit" value="Add Post" />
</p>
</form>
</body>
</html>
blog_read.php
<?php
include('connect.php');
if (isset($_GET['pid'], $_POST['user'], $_POST['category'], $_POST['body'])){
if (add_comment($_GET['pid'], $_POST['user'], $_POST['category'], $_POST['body'])){
header("Location: blog_read.php?pid={$_GET['pid']}");
}else{
header('Location: blog_list.php');
}
die();
}
?>
<!DOCTYPE HTML>
<html lang="en" class="no-js">
<head>
<meta charset="UTF-8">
<title>SITENAME</title>
</head>
<body>
<div>
<?php
if (isset($_GET['pid']) === false || valid_pid($_GET['pid']) === false){
echo 'Invalid post ID.';
}else{
$post = get_post($_GET['pid']);
?>
<h2><?php echo $post['title']; ?></h2>
<h4>By <?php echo $post['user']; ?> on <?php echo $post['date']; ?> (<?php echo count($post['comments']); ?> comments)</h4>
<hr />
<p><?php echo $post ['body']; ?></p>
<hr />
<?php
foreach ($post['comments'] as $comment){
?>
<h4>By <?php echo $comment['user']; ?> on <?php echo $comment['date']; ?></h4>
<p><?php echo $comment['body']; ?></p>
<hr />
<?php
}
?>
<form action="" method="post">
<p>
<label for="user">Name</label>
<input type="text" name="user" id="user" />
</p>
<p>
<textarea name="body" rows="20" cols="60"></textarea>
</p>
<p>
<input type="submit" value="Add Comment" />
</p>
</form>
<?php
}
?>
</div>
</body>
</html>
posts.php
<?php
// checks if the given post id is in the table.
function valid_pid($pid){
$pid = (int)$pid;
$total = mysql_query("SELECT COUNT(`post_id`) FROM `posts` WHERE `post_id` = {$pid}");
$total = mysql_result($total, 0);
if ($total != 1){
return false;
}else{
return true;
}
}
//fetches a summery of all the blog posts.
function get_posts(){
$sql = "SELECT
`posts`.`post_id` AS `id`,
`posts`.`post_title` AS `title`,
LEFT(`posts`.`post_body`, 512) AS `preview`,
`posts`.`post_user` AS `user`,
`posts`.`post_category` AS `category`,
DATE_FORMAT(`posts`.`post_date`, '%d/%m/%Y %H:%i:%s') AS `date`,
`comments`.`total_comments`,
DATE_FORMAT(`comments`.`last_comment`, '%d/%m/%Y %H:%i:%s') AS `last_comment`
FROM `posts`
LEFT JOIN (
SELECT
`post_id`,
COUNT(`comment_id`) AS `total_comments`,
MAX(`comment_date`) AS `last_comment`
FROM `comments`
GROUP BY `post_id`
) AS `comments`
ON `posts`.`post_id` = `comments`.`post_id`
ORDER BY `posts`.`post_date` DESC";
$posts = mysql_query($sql);
$rows = array();
while (($row = mysql_fetch_assoc($posts)) !== false){
$rows[] = array(
'id' => $row['id'],
'title' => $row['title'],
'preview' => $row['preview'],
'user' => $row['user'],
'category' => $row['category'],
'date' => $row['date'],
'total_comments' => ($row['total_comments'] === null) ? 0 : $row['total_comments'],
'last_comment' => ($row['last_comment'] === null) ? 'never' : $row['last_comment']
);
}
return $rows;
}
// fetches a single post from the table.
function get_post($pid){
$pid = (int)$pid;
$sql = "SELECT
`post_title` AS `title`,
`post_body` AS `body`,
`post_user` AS `user`,
`post_category` AS `category`,
`post_date` AS `date`
FROM `posts`
WHERE `post_id` = {$pid}";
$post = mysql_query($sql);
$post = mysql_fetch_assoc($post);
$post['comments'] = get_comments($pid);
return $post;
}
//adds a new blog entry.
function add_post($name, $title, $category, $body){
$name = mysql_real_escape_string(htmlentities($name));
$title = mysql_real_escape_string(htmlentities($title));
$category = mysql_real_escape_string(htmlentities($category));
$body = mysql_real_escape_string(nl2br(htmlentities($body)));
mysql_query("INSERT INTO `posts` (`post_user`, `post_category` `post_title`, `post_body`, `post_date`) VALUES ('{$name}', '{$title}', '{$category}', '{$body}', NOW())");
}
?>
comments.php
<?php
//fetches all of the comments for a given blog post.
function get_comments($pid){
$pid = (int)$pid;
$sql = "SELECT
`comment_body` AS `body`,
`comment_user` AS `user`,
DATE_FORMAT(`comment_date`, '%d/%m/%Y %H:%i:%s') AS `date`
FROM `comments`
WHERE `post_id` = {$pid}";
$comments = mysql_query($sql);
$return = array();
while (($row = mysql_fetch_assoc($comments)) !==false){
$return[] = $row;
}
return $return;
}
//adds a comment.
function add_comment($pid, $user, $body){
if (valid_pid($pid) === false){
return false;
}
$pid = (int)$pid;
$user = mysql_real_escape_string(htmlentities($user));
$body = mysql_real_escape_string(nl2br(htmlentities($body)));
mysql_query("INSERT INTO `comments` (`post_id`, `comment_user`, `comment_body`, `comment_date`) VALUES ({$pid}, '{$user}', '{$body}', NOW())");
return true;
}
?>