rss-bridge/bridges/UnsplashBridge.php

<?php
class UnsplashBridge extends BridgeAbstract {

	const MAINTAINER = 'nel50n';
	const NAME = 'Unsplash Bridge';
	const URI = 'http://unsplash.com/';
	const CACHE_TIMEOUT = 43200; // 12h
	const DESCRIPTION = 'Returns the latests photos from Unsplash';

	const PARAMETERS = array( array(
		'm' => array(
			'name' => 'Max number of photos',
			'type' => 'number',
			'defaultValue' => 20
		),
		'w' => array(
			'name' => 'Width',
			'exampleValue' => '1920, 1680, …',
			'defaultValue' => '1920'
		),
		'q' => array(
			'name' => 'JPEG quality',
			'type' => 'number',
			'defaultValue' => 75
		)
	));

	public function collectData(){
		$width = $this->getInput('w');
		$num = 0;
		$max = $this->getInput('m');
		$quality = $this->getInput('q');
		$lastpage = 1;

		for($page = 1; $page <= $lastpage; $page++) {
			$link = self::URI . '/grid?page=' . $page;
			$html = getSimpleHTMLDOM($link)
				or returnServerError('No results for this query.');

			if($page === 1) {
				preg_match(
					'/=(\d+)$/',
					$html->find('.pagination > a[!class]', -1)->href,
					$matches
				);

				$lastpage = min($matches[1], ceil($max / 40));
			}

			foreach($html->find('.photo') as $element) {
				$thumbnail = $element->find('img', 0);
				$thumbnail->src = str_replace('https://', 'http://', $thumbnail->src);

				$item = array();
				$item['uri'] = str_replace(
					array('q=75', 'w=400'),
					array("q=$quality", "w=$width"),
					$thumbnail->src) . '.jpg'; // '.jpg' only for format hint

				$item['timestamp'] = time();
				$item['title'] = $thumbnail->alt;
				$item['content'] = $item['title']
				. '<br><a href="'
				. $item['uri']
				. '"><img src="'
				. $thumbnail->src
				. '" /></a>';

				$this->items[] = $item;

				$num++;
				if ($num >= $max)
					break 2;
			}
		}
	}
}