Open Graph

There are two main ways to provide Open Graph metadata from your plugin or theme. First, you can implement the filter for a specific property. These filters are of the form opengraph_{name} where {name} is the unqualified Open Graph property name. For example, if you have a plugin that defines a custom post type named “movie”, you could override the Open Graph ‘type’ property for those posts using a function like:

function my_og_type( $type ) {     if ( get_post_type() == "movie" ) {         $type = "movie";     }     return $type; } add_filter( 'opengraph_type', 'my_og_type' ); 

This will work for all of the core Open Graph properties. However, if you want to add a custom property, such as ‘fb:admin’, then you would need to hook into the opengraph_metadata filter. This filter is passed an associative array, whose keys are the qualified Open Graph property names. For example:

function my_og_metadata( $metadata ) {     $metadata['fb:admin'] = '12345,67890';     return $metadata; } add_filter( 'opengraph_metadata', 'my_og_metadata' ); 

Note that you may need to define the RDFa prefix for your properties. Do this using the opengraph_prefixes filter.

The plugin populates the meta ‘name’ attribute alongside the ‘property’ attribute by default. Because both, the og:* and twitter:* names, are actually registered at https://wiki.whatwg.org/wiki/MetaExtensions, this stays compliant with the HTML5 spec. If you want to use a more strict way anyways, you can enable the scrict mode by adding the following line to your config.php

define( 'OPENGRAPH_STRICT_MODE', true );