PHP for CMS Developers - Classes & Exceptions exercises

phpfordevelopers-exercises.php

// "Main"

<?php
/**
 * PHP for Developers - Exercises
 *
 * main/testing
 */

spl_autoload_register(function ($class_name) {
  include $class_name . '.class.php';
});

// Basic Article
$article = new Article('Frist post', 'This is my first post here so be nice.');
var_dump($article);

// What's the difference here?
print $article->title . "\n";
print $article->getTitle() . "\n";

print $article->getBody() . "\n";
print $article->getExcerpt(20) . "\n";


$sa = new SeriesArticle('Frist post', 'This is my first post here so be nice.');
var_dump($sa);

$sa2 = new SeriesArticle('Second post', 'This is my second post.', $sa);
var_dump($sa2);

print $sa->getExcerpt(22) . "\n";

try {
  print $sa->getExcerpt('a') . "\n";
}
catch (Exception $e) {
  print "Invalid value passed: " . $e;
}


// Article.class.php

<?php

class Article {

  protected $title;
  protected $body;

  public function __construct($title, $body) {
    $this->title = $title;
    $this->body = $body;
  }

  public function __get($property) {
    if (property_exists($this, $property)) {
      return $this->$property;
    }
  }
  
  public function getTitle() {
    return $this->title;
  }

  public function getBody() {
    return $this->body;
  }

  public function getExcerpt($length) {
    if (!is_int($length)) {
      throw new UnexpectedValueException();
    }
    return trim(substr($this->body, 0, $length)) . '...';
  }
}


// SeriesArticle.class.php

<?php

class SeriesArticle extends Article {
  public function __construct($title, $body, SeriesArticle $previous = NULL) {
    parent::__construct($title, $body);
  }
}