php-rss-bridge/bridges/FourchanBridge.php

<?php
class FourchanBridge extends BridgeAbstract {

	const MAINTAINER = 'mitsukarenai';
	const NAME = '4chan';
	const URI = 'https://boards.4chan.org/';
	const CACHE_TIMEOUT = 300; // 5min
	const DESCRIPTION = 'Returns posts from the specified thread';

	const PARAMETERS = array( array(
		'c' => array(
			'name' => 'Thread category',
			'required' => true
		),
		't' => array(
			'name' => 'Thread number',
			'type' => 'number',
			'required' => true
		)
	));

	public function getURI(){
		return static::URI . $this->getInput('c') . '/thread/' . $this->getInput('t');
	}

	public function collectData(){

		$html = getSimpleHTMLDOM($this->getURI())
			or returnServerError("Could not request 4chan, thread not found");

		foreach($html->find('div.postContainer') as $element){
			$item = array();
			$item['id'] = $element->find('.post', 0)->getAttribute('id');
			$item['uri'] = $this->getURI() . '#' . $item['id'];
			$item['timestamp'] = $element->find('span.dateTime', 0)->getAttribute('data-utc');
			$item['author'] = $element->find('span.name', 0)->plaintext;

			$file = $element->find('.file', 0);

			if(!empty($file)){
				$item['image'] = $element->find('.file a', 0)->href;
				$item['imageThumb'] = $element->find('.file img', 0)->src;
				if(!isset($item['imageThumb']) and strpos($item['image'], '.swf') !== false)
					$item['imageThumb'] = 'http://i.imgur.com/eO0cxf9.jpg';
			}

			if(!empty($element->find('span.subject', 0)->innertext)){
				$item['subject'] = $element->find('span.subject', 0)->innertext;
			}

			$item['title'] = 'reply ' . $item['id'] . ' | ' . $item['author'];
				if(isset($item['subject'])){
					$item['title'] = $item['subject'] . ' - ' . $item['title'];
				}

			$content = $element->find('.postMessage', 0)->innertext;
			$content = str_replace('href="#p', 'href="' . $this->getURI() . '#p', $content);
			$item['content'] = '<span id="' . $item['id'] . '">' . $content . '</span>';

			if(isset($item['image'])){
				$item['content'] = '<a href="'
				. $item['image']
				. '"><img alt="'
				. $item['id']
				. '" src="'
				. $item['imageThumb']
				. '" /></a><br>'
				.$item['content'];
			}
			$this->items[] = $item;
		}
		$this->items = array_reverse($this->items);
	}
}