Script to pull RSS data and create a Trello card for each post. Useful for Beeminder RSS integration since they don't support it but they do support Trello.

composer.json

{
    "name": "grin/rss-to-trello",
    "require": {
        "simplepie/simplepie": "~1.3",
        "guzzlehttp/guzzle": "~5.0"
    },
    "authors": [
        {
            "name": "Alex Grintsvayg",
            "email": "[email protected]"
        }
    ]
}

RssToTrello.php

#!/usr/bin/env php
<?php

require __DIR__.'/vendor/autoload.php';

// FILL IN ALL THESE VALUES. ALL ARE REQUIRED
const TRELLO_KEY = ''; // https://trello.com/1/appKey/generate
const TRELLO_TOKEN = ''; // https://trello.com/1/connect?key=YOUR-KEY-HERE&name=rss2trello&response_type=token&scope=read,write&expiration=never
const TRELLO_BOARD_ID = ''; // the hashs after the /b/ when you're viewing the board. e.g. https://trello.com/b/d5jHzcDp/
const TRELLO_LIST = ''; // name of list where cards will be added
const FEED_URL = ''; // url of your feed


$guzzle = new GuzzleHttp\Client();
$trelloApiEndpoint = 'https://api.trello.com/1';
$trelloAuth = ['key' => TRELLO_KEY, 'token' => TRELLO_TOKEN];
$response = $guzzle->get($trelloApiEndpoint.'/boards/'.TRELLO_BOARD_ID.'/lists/open', ['query' => $trelloAuth]);
$lists = $response->json();

$listToUse = null;
foreach($lists as $list)
{
  if ($list['name'] == TRELLO_LIST)
  {
    $listToUse = $list;
    break;
  }
}

if (!$listToUse) 
{
  echo "Could not find list " . TRELLO_LIST . "\n";
  die();
}

$listData = $guzzle->get($trelloApiEndpoint.'/lists/'.$listToUse['id'], [
  'query' => array_merge($trelloAuth, [
    'fields' => 'name',
    'cards' => 'open',
    'card_fields' => 'id,name,desc'
  ])
]);

$cards = $listData->json()['cards'];

$existingPostIds = [];
foreach($cards as $card)
{
  $existingPostIds[$card['desc']] = true;
}


$feed = new SimplePie();
$feed->set_feed_url(FEED_URL);
$feed->enable_cache(false);
$feed->init();

$items = $feed->get_items();
$count = 0;

foreach ($items as $item)
{
  if (!isset($existingPostIds[$item->get_id()]))
  {
    echo "Adding " . $item->get_title() . "\n";
    $guzzle->post($trelloApiEndpoint.'/cards', [
      'body' => array_merge($trelloAuth,[
        'name' => $item->get_title(),
        'desc' => $item->get_id(),
        'due' => null,
        'idList' => $listToUse['id'],
        'urlSource' => null
      ])
    ]);
  }

  $count++;
  if ($count > 1)
  {
    break;
  }
}

In my fork I updated this script to latest versions of simplepie and guzzle. Also I added the possibility to have multiple feeds processed.