How to add custom variables in Yoast SEO

If you’re using Yoast SEO and ACF, you’ll certainly need to use ACF fields in Yoast to obtain a customised title and description.

Simply create a snippet variable and then integrate it into your Yoast SEO configuration. To do this, add a function to your plugin:

<?php
// create custom variables for Yoast SEO, based on CPT & ACF
add_action('wpseo_register_extra_replacements', 'register_custom_yoast_variables');
function register_custom_yoast_variables() {
	wpseo_register_var_replacement( '%%Catégorie du véhicule%%', 'get_rent_category', 'advanced', 'Catégorie du véhicule' );
	wpseo_register_var_replacement( '%%Description du véhicule%%', 'get_rent_description', 'advanced', 'Description courte du véhicule' );
}
function get_rent_category() {
	global $post;
	if($post&&($post->post_type=='rent')):
		$type = get_field('type', $post->ID);
		return $type['label'];
	endif;
}
function get_rent_description() {
	global $post;
	if($post&&($post->post_type=='rent')):
		$description = get_field('description', $post->ID);
		return wp_trim_words($description,18);
	endif;
}
?>

Variables are now available in Yoast SEO:

You can find here the list of available snippet variables in Yoast SEO.