Filter the list of predefined dynamic variables for automatic schemas

filter-predefined-dynamic-variables-for-automatic-schemas.php

add_filter('seopress_schemas_mapping_select', 'sp_schemas_mapping_select');
function sp_schemas_mapping_select($select) {
	//Add the new group option + option to the list
	$select['Custom variables'] = [
		'my_custom_var_key' => __('My super custom var', 'wp-seopress-pro'),
	];

	return $select;
}
add_filter('seopress_schemas_dyn_variables', 'sp_schemas_dyn_variables');
function sp_schemas_dyn_variables($vars) {
	//add the variable key
	$vars[] = 'my_custom_var_key';
	
	return $vars;
}
add_filter('seopress_schemas_dyn_variables_replace', 'sp_schemas_dyn_variables_replace');
function sp_schemas_dyn_variables_replace($values) {
	//replace the new key by our own value
	//eg: author last name
	$values[] = get_the_author_meta('last_name');

	return $values;
}