implemented database, article cards, and parsing from markdown.

functions/article_functions.php

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+<?php
+require 'db_functions.php';
+
+/*
+ * Reads the markdown file for a given article and generates the HTML for it.
+ */
+function article_page_from_markdown($article_id)
+{
+    $query = 'SELECT * FROM articles WHERE article_id = ' . $article_id . ';';
+    $article = query_db_one_result($query);
+    $markdown = read_file_one_string($_ENV['ARTICLES_PATH'] . $article_id . '/' . $article['markdown_file_path']);
+
+    // Instantiate Parsedown
+    $parsedown = new Parsedown();
+
+    // Example usage
+    $html = $parsedown->text($markdown);
+
+    return $html;
+}
+
+/*
+ * Generates cards for a given article.
+ */
+function article_card($article_id)
+{
+    $article_query = 'SELECT * FROM articles WHERE article_id = ' . $article_id . ';';
+    $article = query_db_one_result($article_query);
+
+    $article_tags_query = 'SELECT tag FROM article_tags INNER JOIN tags ON article_tags.tag_id = tags.tag_id WHERE article_id = ' . $article_id . ';';
+    $tags_results = query_db_one_or_more_results($article_tags_query);
+    $tags_html = '<div class="tag_row">';
+
+    while ($row = mysqli_fetch_array($tags_results))
+        $tags_html .= '<a href="/article.php?tag=' . $row['tag'] . '" class="tag">#' . $row['tag'] . '</a>';
+
+    $tags_html .= '</div>';
+
+    $author_query = 'SELECT username, profile_picture FROM user WHERE user_id = ' . $article['author_id'] . ';';
+    $author = query_db_one_result($author_query);
+
+    $card = '
+        <div class="article_card">
+            <div class="row">
+                <h4>' . $article['title'] . '</h4>
+                <div class="card_info_box">
+                    <div class="col-right">
+                        <small>Written by: ' . $author['username'] . '</small>
+                        <small>Published: ' . $article['published_at'] . '</small>
+                    </div>
+                    <div class="card_pic_box">
+                        <img src="/profile_pictures/' . $author['profile_picture'] . '" class="card_profile_picture">
+                    </div>
+                </div>
+            </div>
+            <div class="line"></div>
+            <p>' . $article['excerpt'] . '</p>
+            <div class="row">
+                <a href="/article.php?article_id=' . $article['article_id'] . '" class="button">Read More</a>
+                <div class="tag_box">' . $tags_html . '</div>
+            </div>
+        </div>
+    ';
+
+    return $card;
+}
+
+/*
+ * Displays the article creation wizard and opens a new markdown file.
+ */
+function create_article() {}

functions/db_functions.php

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+<?php
+// Use environment variables for the database password and IP address.
+$db_user = $_ENV['DATABASE_USER'];
+$db_pass = $_ENV['DATABASE_PASSWORD'];
+$ip_addr = $_ENV['IP_ADDRESS'];
+
+// Make some constants
+if ($_SERVER['HTTP_HOST'] == 'localhost') {
+    define('HOST', 'localhost');
+    define('USER', $db_user);
+    define('PASS', $db_pass);
+    define('DB', 'vintagecoding');
+} else {
+    define('HOST', $ip_addr);
+    define('USER', $db_user);
+    define('PASS', $db_pass);
+    define('DB', 'vintagecoding');
+}
+
+/*
+ * Handles any queries that should have only one row results.
+ */
+function query_db_one_result($query_stmt)
+{
+    $conn = get_connection();
+    $results = mysqli_query($conn, $query_stmt);
+    mysqli_close($conn);
+
+    if (mysqli_num_rows($results) == 0 || mysqli_num_rows($results) > 1)
+        return null;
+    else
+        return mysqli_fetch_assoc($results);
+}
+
+function query_db_one_or_more_results($query_stmt)
+{
+    $conn = get_connection();
+    $results = mysqli_query($conn, $query_stmt);
+    mysqli_close($conn);
+
+    if (mysqli_num_rows($results) == 0)
+        return null;
+    else
+        return $results;
+}
+
+function get_connection()
+{
+    // Connect to the DB
+    $conn = mysqli_connect(HOST, USER, PASS, DB);
+
+    return $conn;
+}

functions/functions.php

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+<?php
+
+/*
+ * Reads in file contents and stores as a single string.
+ */
+function read_file_one_string($file_path)
+{
+    $fs = fopen($file_path, 'r');
+    $string = fread($fs, filesize($file_path));
+    return $string;
+}
+
+function pretty_dump($arr)
+{
+    return '
+    <pre>
+        ' . print_r($arr) . '
+    </pre>
+    ';
+}

functions/init.php

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+<?php
+
+// Initialize Composer.
+require_once 'vendor/autoload.php';
+
+// Load environment variables.
+$dotenv = Dotenv\Dotenv::createImmutable(__DIR__ . '/../');
+$dotenv->safeLoad();
+
+// Set SESSION variable.
+$_SESSION['initialized'] = true;