Twitter Cards

I wrote this plugin for my own site, NiallKennedy.com, added some slight flexibility through filters, and released the plugin on GitHub as a PHP library with a WordPress plugin wrapper. I use summary cards for my site's articles. If you would like to add better support for photos, galleries, videos, apps, or products exposed to Twitter you can fork my work and optionally send some code in a pull request.

First you need to hook into the filter from code in your theme or site plugin(s). You can add this code to your theme's functions.php file or create a new file in wp-content/mu-plugins/twitter-cards.php or something similar. add_filter( 'twitter_cards_properties', 'twitter_custom' ); Next you need to modify the array passed to the filter with your own values. function twitter_custom( $twitter_card ) { if ( is_array( $twitter_card ) ) { $twitter_card['creator'] = '@niall'; $twitter_card['creator:id'] = '1085'; } return $twitter_card; } The values generated by the plugin are passed to your new function for manipulation before output. The Twitter API function users/show is a good way to lookup your account information. Copy the screen_name and id_str to creator and creator:id array values respectively in your filter function referenced above. https://api.twitter.com/1/users/show.json?screen_name=niall Your Twitter screenname may change but your Twitter ID will remain the same. Grab both while you are setting up your site to provide Twitter with the best data.

The plugin outputs HTML-style void elements without a trailing slash by default. Add XML-style trailing slashes by returning a value of xml on the twitter_cards_htmlxml filter.