personal-website/docs/www/blog/article.php

<?php
$COMMONS = $_SERVER['DOCUMENT_ROOT'] . "/../common";

include_once($COMMONS."/header.php");
include_once($COMMONS."/utils.php");

class BlogpostComment
{
	public $comment_id;
	public $parent_id;
	public $blogpost_id;
	public $poster_id;
	public $timestamp;
	public $content;
}


class Blogpost
{
	public $blogpost_id;
	public $title;
	public $content;
	public $date_posted;
	public $tags;

	/**
	 * Display the article, or a warning message.
	 */
	function display_article(){
		// If a blog with given ID was not found display warning message.
		if(!$this->title){
			printf("
			<article>
				<h2> Article not found </h2>
				<hr>
				<p>
					I am sorry, but I couldn't find an article with this ID.
				</p>
			</article>
			");
			return;
		}

		// Begin the article
		printf("<article>");

		// Display the blogpost name
		printf("<h2>%s</h2>", $this->title);

		// Display the blog metadata
		printf("<div class=\"blog-metadata\">");

		// Display tags
		for($i = 0; $i < count($this->tags); $i++) {
			$tag = $this->tags[$i];
			printf("
			<span class=\"blog-tag\" style=\"background-color: %s\">
				%s
			</span>", $tag["color"], $tag["name"]);
		}

		// Display publish date and end metadata div
		printf("<span class=\"blog-publish-date\">Published on: %s</span></div>",
			date("Y-m-d", strtotime($this->date_posted)));

		// Display hrule, article content and end the article
		printf("</article><hr><article>%s</article>", $this->content);
	}

	/**
	 * Constructor for the blogpost.
	 * $blogpost_id		GUID of the blogpost in the database.
	 * $title			Title of the blogpost.
	 * $content			Content of the blogpost article.
	 * $date_posted		Timestamp at publishing of article.
	 * $tags			Array of the tags this article has.
	 */
	public function __construct($blogpost_id, $title, $content,
								$date_posted, $tags){
		$this->blogpost_id = $blogpost_id;
		$this->title = $title;
		$this->content = $content;
		$this->date_posted = $date_posted;
		$this->tags = $tags;
	}
}

/**
 * Try to load info about the blog with guid in GET and set global
 * variables accordingly.
 */
function get_blog_info($conn, $blogId){
	// Check DB connection
	if($conn == null){
		printf("
			<article>
				<h1>Failed DB connection, cannot proceed!</h1>
				If you see this error in production,
				please shoot me an email with helpful details.
			</article>");
		include_once($COMMONS."/footer.php");
		die();
	}

	// Prepare and bind statement for gathering blogpost info
	$stmt = $conn->prepare("SELECT title, content, date_posted
		FROM blogposts WHERE blogpost_id = :blogpost_id;");
	$stmt->bindParam(":blogpost_id", $blogId);

	// Execute the statement
	$stmt->execute();

	// Fetch the blogpost
	$result = $stmt->fetch(PDO::FETCH_ASSOC);

	// If no post with given guid was found,
	// there is no information to gather, return.
	if(!$result){
		return null;
	}

	// Prepare new statement for selecting the tags for a given blogpost
	$stmt = $conn->prepare("SELECT name, color FROM
		blogpost_tags INNER JOIN blogpost_has_tag ON
		blogpost_tags.tag_id = blogpost_has_tag.tag_id WHERE
		blogpost_id = :blogpost_id;");

	// Bind and execute the tag select
	$stmt->bindParam(":blogpost_id", $blogId);
	$stmt->execute();

	// Fetch the tags
	$tags_arr = $stmt->fetchall(PDO::FETCH_ASSOC);

	// Set the variables
	$blogTitle = $result["title"];
	$blogContent = $result["content"];
	$datePosted = $result["date_posted"];
	$tags = $tags_arr;

	return new Blogpost($blogId, $blogTitle, $blogContent, $datePosted, $tags);
}

/**
 * Display all the comments responding to a given article.
 */
function display_comments($conn, $blogId){
	// Check DB connection
	if($conn == null){
		printf("
			<article>
				<h1>
					Failed to load comments due to database connection error!
				</h1>
				If you see this error in production,
				please shoot me an email with helpful details.
			</article>");
		return;
	}

	// Prepare statement for selecting all coments replying to a given article.
	$stmt = $conn->prepare("SELECT;");

	// Bind and execute the tag select
	$stmt->bindParam(":blogpost_id", $blogId);
	$stmt->execute();

	// Fetch the tags
	$tags_arr = $stmt->fetchall(PDO::FETCH_ASSOC);

}

// Get the blog id.
$blogId = sanitize_input($_GET["guid"]);

$blogPost = null;
// Try to get info about blog
if($blogId) {
	$blogPost = get_blog_info($conn, $blogId);
}

// Display the header with title being the blog name, or not found message.
display_header($blogPost ? $blogPost->title : "Article not found");

// Display the blog
$blogPost->display_article();

include_once($COMMONS."/footer.php");
?>