Bullshit-Free Engineering

Connecting Posts in MultilingualPress from Multiple Post Types

April 6, 2024

Filter the behavior of MultilingualPress to allow for connecting translations across post types.

	<?php
	/**
	* Filter the post search arguments allow for cross-post-type connections in MultilingualPress.
	*
	* MultilingualPress (MLP) connects translated posts and pages, but by default doesn’t connection across post types.
	* This changes that behavior by allowing other post types to be chosen in the interface. No other modifications are
	* needed to achieve this, because MLP uses the post_id and doesn’t care about post_type outside of the search query.
	*
	* @param array $args the WP_Term_Query arguments used.
	* @return array
	*/
	add_filter( ‘multilingualpress.remote_post_search_arguments’, function( $args ) {

	// Change this array to the post types you want to connect.
	$translated_post_types = array( ‘post’, ‘page’, ‘product’ );

	// Make sure we have a valid $args[‘post_type’] value
	// and that we aren’t removing the current post type.
	if ( isset( $args[‘post_type’] )
	&& is_string( $args[‘post_type’] )
	&& in_array( $args[‘post_type’], $translated_post_types, true ) ) {
	$args[‘post_type’] = $translated_post_types;
	}

	return $args;
	}, 100, 1 );