Training

Article.php

<?php

/**
 * This is a generic Article renderer
 *
 * @author   Christian Blanquera <[email protected]>
 * @standard PSR-2
 */
class Article extends Post {
    /**
     * @const WEBSITE
     */
    const WEBSITE = 'http://wordpress.com';

    /**
     * @int $count
     */
    public static $count = 0;

    /**
     * @string|null $url
     */
    private $url = null;

    protected static $database = null;

    protected $id = null;

    protected $created = null;

    protected $updated = null;

    /**
     * Self instantiator
     *
     * @param string|null $title  This is the title
     * @param string|null $detail This is the detail
     *
     * @return Article
     */
    public static function getInstance($title = null, $detail = null)
    {
        $class = __CLASS__;
        return new $class($title, $detail);
    }

    /**
     * Constructor
     *
     * @param string|null $title
     * @param string|null $detail
     */
    public function __construct($title = null, $detail = null)
    {
        parent::__construct($title, $detail);
        self::$count++;
    }

    /**
     * Returns the count of all the articles made
     *
     * @return int
     */
    public function getCount()
    {
        return self::$count;
    }

    /**
     * Sets the title
     *
     * @param string
     *
     * @return Article
     */
    public function setTitle($title)
    {
        parent::setTitle($title);
        $this->setUrl($this->title);
        return $this;
    }

    /**
     * Returns the URL
     *
     * @return string
     */
    public function getUrl()
    {
        return $this->url;
    }

    /**
     * Returns a rendered version of the Article
     *
     * @return string
     */
    public function render()
    {
        return parseTemplate(__DIR__ . '/template.html', [
            'id' => $this->id,
            'title' => $this->getTitle(),
            'website' => self::WEBSITE,
            'url' => $this->getUrl(),
            'detail' => $this->getDetail()
        ]);
    }

    public static function setDatabase($database)
    {
        self::$database = $database;
    }

    public static function search()
    {
        return self::$database->search('article');
    }

    public function load($id)
    {
        $results = self::$database->get('article', $id);

        if(!is_array($results)) {
            return $this;
        }

        $this->id = $results['article_id'];
        $this->title = $results['article_title'];
        $this->url = $results['article_url'];
        $this->detail = $results['article_detail'];
        $this->created = $results['article_created'];
        $this->updated = $results['article_updated'];

        return $this;
    }

    public function save()
    {
        //if there's an id
        if(is_numeric($this->id)) {
            //update
            self::$database->update('article', $this->id, [
                'article_title' => $this->title,
                'article_url' => $this->url,
                'article_detail' => $this->detail,
                'article_updated' => date('Y-m-d H:i:s')
            ]);

            return $this;
        }

        //other wise insert
        self::$database->create('article', [
            'article_title' => $this->title,
            'article_url' => $this->url,
            'article_detail' => $this->detail,
            'article_created' => date('Y-m-d H:i:s'),
            'article_updated' => date('Y-m-d H:i:s')
        ]);

        return $this;
    }

    public function remove()
    {
        self::$database->remove('article', $this->id);
        return $this;
    }

    /**
     * Formats the URL
     *
     * @param string
     */
    private function setUrl($title)
    {
        $this->url = preg_replace('/[^a-zA-Z0-9\ ]/', '', $title);
        $this->url = str_replace(' ', '-', $this->url);
        $this->url = strtolower($this->url);
    }
}

bootstrap.php

<?php
include __DIR__ . '/helpers.php';
bootstrap();

Database.php

<?php

class Database
{
    protected $name = null;
    protected $user = null;
    protected $password = null;

    protected $connection = null;

    public function __construct($name, $user, $password)
    {
        $this->name = $name;
        $this->user = $user;
        $this->password = $password;
    }

    public function create($table, array $values)
    {
        $keys = array_keys($values);
        $questions = array_fill(0, count($values), '?');

        return $this->query(
            'INSERT INTO ' . $table . ' '
            . '(' . implode(', ', $keys) . ')'
            . 'VALUES (' . implode(', ', $questions) . ')',
            array_values($values)
        );
    }

    public function update($table, $id, array $values)
    {
        $set = [];
        foreach($values as $key => $value) {
            $set[] = $key . ' = ?';
        }

        $primary = $table . '_id';

        $values = array_values($values);
        $values[] = $id;

        return $this->query(
            'UPDATE ' . $table . ' SET '
            . implode(', ', $set)
            . ' WHERE ' . $primary . ' = ?',
            $values
        );
    }

    public function remove($table, $id)
    {
        $primary = $table . '_id';

        return $this->query(
            'DELETE FROM ' . $table
            . ' WHERE ' . $primary . ' = ?',
            [$id]
        );
    }

    public function search($table)
    {
        return $this->query('SELECT * FROM ' . $table);
    }

    public function get($table, $id)
    {
        $results = $this->query(
            'SELECT * FROM ' . $table
            . ' WHERE ' . $primary . ' = ?',
            [$id]
        );

        if(!isset($results[0])) {
            return null;
        }

        return $results[0];
    }

    public function query($query, array $values = [])
    {
        if(is_null($this->connection)) {
            $template = 'mysql:dbname={NAME};host=127.0.0.1';
            $template = str_replace('{NAME}', $this->name, $template);
            $this->connection = new PDO($template, $this->user, $this->password);
        }

        $query = $this->connection->prepare($query);
        $query->execute($values);
        return $query->fetchAll(PDO::FETCH_ASSOC);
    }
}

form.html

<form method="post" action="basics.php">
    <div>
        <label>Title</label>
        <input type="text" name="article_title" value="{TITLE}" />
    </div>
    <div>
        <label>Detail</label>
        <textarea name="article_detail" rows="10">{DETAIL}</textarea>
    </div>
    <input type="hidden" name="article_id" value="{ID}" />
    <button type="submit">Create</button>
</form>

helpers.php

<?php

include __DIR__ . '/Database.php';
include __DIR__ . '/PostInterface.php';
include __DIR__ . '/Post.php';
include __DIR__ . '/Article.php';

function parseTemplate($file, $variables)
{
    $template = file_get_contents($file);
    foreach($variables as $key => $value) {
        $template = str_replace('{'.strtoupper($key).'}', $value, $template);
    }

    return $template;
}

function create()
{
    if(!empty($_POST) && !is_numeric($_POST['article_id'])) {
        Article::getInstance()
        ->setTitle($_POST['article_title'])
        ->setDetail($_POST['article_detail'])
        ->save();
    }
}

function remove()
{
    if(isset($_GET['remove']) && is_numeric($_GET['remove'])) {
        Article::getInstance()
            ->load($_GET['remove'])
            ->remove();
    }
}

function update()
{
    if(!empty($_POST) && is_numeric($_POST['article_id'])) {
        Article::getInstance()
            ->load($_POST['article_id'])
            ->setTitle($_POST['article_title'])
            ->setDetail($_POST['article_detail'])
            ->save();
    }
}

function bootstrap()
{
    Article::setDatabase(new Database('blog', 'root', ''));

    remove();

    $form = [
        'id' => null,
        'title' => null,
        'detail' => null
    ];

    if(isset($_GET['update']) && is_numeric($_GET['update'])) {
        $article = Article::getInstance()->load($_GET['update']);

        $form = [
            'id' => $_GET['update'],
            'title' => $article['title'],
            'detail' => $article['detail']
        ];
    }

    create();
    update();

    echo parseTemplate(__DIR__ . '/form.html', $form);

    foreach(Article::search() as $article) {
        echo Article::getInstance()->load($article['article_id']);
    }
}

Post.php

<?php

/**
 * This is a generic Post
 *
 * @author   Christian Blanquera <[email protected]>
 * @standard PSR-2
 */
abstract class Post implements PostInterface, ArrayAccess {
    /**
     * @string|null $title
     */
    protected $title = null;

    /**
     * @string|null $detail
     */
    public $detail = null;

    /**
     * Returns a rendered version of the Article
     *
     * @return string
     */
    abstract public function render();

    /**
     * Constructor
     *
     * @param string|null $title
     * @param string|null $detail
     */
    public function __construct($title = null, $detail = null)
    {
        $this
            ->setTitle($title)
            ->setDetail($detail);
    }

    /**
     * Converts object to string
     *
     * @return string
     */
    public function __toString()
    {
        return $this->render();
    }

    /**
     * Returns the title
     *
     * @return string
     */
    public function getTitle()
    {
        return $this->title;
    }

    /**
     * Sets the title
     *
     * @param string
     *
     * @return Article
     */
    public function setTitle($title)
    {
        $this->title = $title;
        return $this;
    }

    /**
     * Returns the detail
     *
     * @return string
     */
    public function getDetail()
    {
        return $this->detail;
    }

    /**
     * Sets the detail
     *
     * @param string
     *
     * @return Article
     */
    public function setDetail($detail)
    {
        $this->detail = $detail;
        return $this;
    }

    public function offsetSet($offset, $value)
    {
        $method = 'set' . ucfirst($offset);
        if(method_exists($this,  $method)) {
            $this->$method($value);
        }
    }

    public function offsetExists($offset)
    {
        return isset($this->$offset) || is_null($this->$offset);
    }

    public function offsetUnset($offset)
    {
        if($this->offsetExists($offset)) {
            $this->$offset = null;
        }
    }

    public function offsetGet($offset)
    {
        $method = 'get' . ucfirst($offset);
        if(method_exists($this, $method)) {
            return $this->$method($value);
        }

        return null;
    }
}

PostInterface.php

<?php

/**
 * This is a generic Post
 *
 * @author   Christian Blanquera <[email protected]>
 * @standard PSR-2
 */
interface PostInterface {
    /**
     * Returns the title
     *
     * @return string
     */
    public function getTitle();

    /**
     * Sets the title
     *
     * @param string
     *
     * @return Article
     */
    public function setTitle($title);

    /**
     * Returns the detail
     *
     * @return string
     */
    public function getDetail();

    /**
     * Sets the detail
     *
     * @param string
     *
     * @return Article
     */
    public function setDetail($detail);
}

template.html

<h3>{TITLE}</h3>
<a href="{WEBSITE}/{URL}">{URL}</a>
| <a href="?update={ID}">Edit</a>
| <a href="?remove={ID}">Remove</a>
<p>{DETAIL}</p>