rss-bridge/bridges/UnsplashBridge.php

<?php
class UnsplashBridge extends BridgeAbstract {

	public function loadMetadatas() {

		$this->maintainer = "nel50n";
		$this->name = "Unsplash Bridge";
		$this->uri = "http://unsplash.com/";
		$this->description = "Returns the latests photos from Unsplash";
		$this->update = '2016-08-17';

		$this->parameters[] =
		'[
			{
				"name" : "Max number of photos",
				"identifier" : "m",
				"type" : "number"
			},
			{
				"name" : "Width",
				"identifier" : "w",
				"exampleValue" : "1920, 1680, ..."
			},
			{
				"name" : "JPEG quality",
				"identifier" : "q",
				"type" : "number"

			}

		]';
	}

    public function collectData(array $param){
        $html = '';
        $baseUri = 'http://unsplash.com';

        $width = $param['w'] ?: '1920';    // Default width

        $num = 0;
        $max = $param['m'] ?: 20;
        $quality = $param['q'] ?: 75;
        $lastpage = 1;

        for ($page = 1; $page <= $lastpage; $page++) {
            $link = $baseUri.'/grid?page='.$page;
            $html = $this->file_get_html($link) or $this->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 = new \Item();
                $item->uri = str_replace(array('q=75', 'w=400'),
                                         array("q=$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;
            }
        }
    }

    public function getCacheDuration(){
        return 43200; // 12 hours
    }
}