About RSS Feed Loader

Given an RSS feed URL, this module will pull it, and let you foreach() it or render it. This module will also cache feeds that you retrieve with it.

Category 1Markup Generation
Markup modules that are called upon to generate or parse markup (like HTML). Markup modules are most often used on the front-end of a site (rather than admin).
Category 2Import/Export
Modules that work with importing or exporting data.
Category 3Social, Feeds, Services
Modules that provide or work with social networking services and/or external feeds.
Release StateStable
Should be safe for use in production environments. *
Authorryan
Module Version1.0.0
Class NameMarkupLoadRSS
Compatibility2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7
Date AddedJuly 23, 2012
Recommended ByNew recommendations may take up to 1 day to appear.

Details

This module is the opposite of the MarkupRSS module that comes with ProcessWire because that module creates RSS feeds. Whereas this module loads them and gives you easy access to the data to do whatever you want.

For a simple live example of this module in use, see the processwire.com homepage (and many of the inside pages) for the "Latest Forum Post" section in the sidebar.

Requirements
This module requires that your PHP installation have the 'allow_url_fopen' option enabled. By default, it is enabled in PHP. However, some hosts turn it off for security reasons. This module will prevent itself from being installed if your system doesn't have allow_url_fopen. If you run into this problem, let me know as we may be able to find some other way of making it work without too much trouble.

Instructions

This module's files should be placed in /site/modules/MarkupLoadRSS/
How to install or uninstall modules

README

ProcessWire RSS Loader
======================

Given an RSS feed URL, this module will pull it, and let you foreach() it
or render it. This module will also cache feeds that you retrieve with it.

For ProcessWire 2.1+

Copyright 2011 by Ryan Cramer


INSTALLATION
============

The MarkupLoadRSS module installs in the same way as all PW modules:

1. Copy the MarkupLoadRSS.module file to your /site/modules/ directory.
2. Login to ProcessWire admin, click 'Modules' and 'Check for New Modules'.
3. Click 'Install' next to the Markup Load RSS module.


USAGE
=====

The MarkupLoadRSS module is used from your template files.
Usage is described with these examples:


Example #1: Cycling through a feed
----------------------------------

$rss = $modules->get("MarkupLoadRSS");
$rss->load("http://www.di.net/articles/rss/");

foreach($rss as $item) {
echo "<p>";
echo "<a href='{$item->url}'>{$item->title}</a> ";
echo $item->date . "<br /> ";
echo $item->description;
echo "</p>";
}


Example #2: Using the built-in rendering
----------------------------------------

$rss = $modules->get("MarkupLoadRSS");
echo $rss->render("http://www.di.net/articles/rss/");


Example #3: Specifying options and using channel titles
-------------------------------------------------------

$rss = $modules->get("MarkupLoadRSS");

$rss->limit = 5;
$rss->cache = 0;
$rss->maxLength = 255;
$rss->dateFormat = 'm/d/Y H:i:s';

$rss->load("http://www.di.net/articles/rss/");

echo "<h2>{$rss->title}</h2>";
echo "<p>{$rss->description}</p>";
echo "<ul>";

foreach($rss as $item) {
echo "<li>" . $item->title . "</li>";
}

echo "</ul>";


OPTIONS
=======

Options MUST be set before calling load() or render().

// specify that you want to load up to 3 items (default = 10)
$rss->limit = 3;

// set the feed to cache for an hour (default = 120 seconds)
// if you want to disable the cache, set it to 0.
$rss->cache = 3600;

// set the max length of any field, i.e. description (default = 2048)
// field values longer than this will be truncated
$rss->maxLength = 255;

// tell it to strip out any HTML tags (default = true)
$rss->stripTags = true;

// tell it to encode any entities in the feed (default = true);
$rss->encodeEntities = true;

// set the date format used for output (use PHP date string)
$rss->dateFormat = "Y-m-d g:i a";

See the $options array in the class for more options.

You can also customize all output produced by the render() method,
though it is probably easier just to foreach() the $rss yourself. But
see the module class file and $options array near the top to see how
to change the markup that render() produces.


MORE DETAILS
============

This module loads the given RSS feed and all data from it. It then populates
that data into a WireArray of Page-like objects. All of the fields in the RSS
<items> feed are accessible, so you use whatever the feed provides.

The most common and expected field names in the RSS channel are:

$rss->title
$rss->pubDate (or $rss->date)
$rss->description (or $rss->body)
$rss->link (or $rss->url)
$rss->created (unix timestamp of pubDate)

The most common and expected field names for each RSS item are:

$item->title
$item->pubDate (or $item->date)
$item->description (or $item->body)
$item->link (or $item->url)
$item->created (unix timestamp of pubDate)

For convenience and consistency, ProcessWire translates some common RSS
fields to the PW-equivalent naming style. You can choose to use either the
ProcessWire-style name or the traditional RSS name, as shown above.


HANDLING ERRORS
===============

If an error occurred when loading the feed, the $rss object will
have 0 items in it:

$rss->load("...");
if(!count($rss)) { error }

In addition, the $rss->error property always contains a detailed
description of what error occurred:

if($rss->error) { echo "<p>{$rss->error}</p>"; }

I recommend only checking for or reporting errors when you are
developing and testing. On production sites you should skip
error checking/testing, as blank output is a clear indication
of an error. This module will not throw runtime exceptions so
if an error occurs, it's not going to halt the site.


SUPPORT
=======

Visit the ProcessWire forum at http://processwire.com/talk/


Copyright 2011 by Ryan Cramer


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