post type helper

// get posts in php
$blog_posts = Artikel::get_posts( 2, [ IbTaxonomies::CONTENT_TYPE => [ 'blog' ] ] );

// function for each post type which calls a helper
/**
 * Class Artikel
 */
class Artikel {

    /**
     * Get articles
     *
     * @param $amount
     * @param $taxonomy
     * @param $meta
     * @param $add_to_ignore
     */
    public static function get_posts( $amount = 24, $taxonomy = [], $meta = [], $add_to_ignore = true ) : array {
        return PostsHelper::get_posts( IbPostTypes::ARTICLE, $amount, $taxonomy, $meta, $add_to_ignore );
    }
}


/**
 * Class PostsHelper
 */
class PostsHelper {

    /**
     * Get articles
     *
     * @param $post_type
     * @param $amount
     * @param $taxonomy
     * @param $meta
     * @param $add_to_ignore
     */
    public static function get_posts( $post_type = IbPostTypes::ARTICLE, $amount = 24, $taxonomy = [], $meta = [], $add_to_ignore = true ) : array {
        $exclude    = [];
        $meta_query = [];
        $tax_query  = [];

        global $used_post_ids;
        if ( ! empty( $used_post_ids ) ) {
            $exclude = $used_post_ids;
        }

        $post_args = array(
            'post_type'      => $post_type,
            'posts_per_page' => $amount,
            'exclude'        => $exclude,
            'fields'         => 'ids',
        );

        if ( ! empty( $meta ) ) {
            foreach( $meta as $meta_key => $meta_values ) {
                if ( empty( $meta_values ) ) {
                    $meta_query[] = [
                        'key'     => $meta_key,
                        'compare' => 'EXISTS',
                    ];
                } else {
                }
            }
        }

        if ( ! empty( $taxonomy ) ) {
            foreach( $taxonomy as $tax_slug => $terms ) {
                $tax_query[] = [
                    'taxonomy' => $tax_slug,
                    'field'    => 'slug',
                    'terms'    => $terms,
                ];
            }
        }
        if ( ! empty( $meta_query ) ) {
            $post_args[ 'meta_query' ] = $meta_query;
        }
        if ( ! empty( $tax_query ) ) {
            $post_args[ 'tax_query' ] = $tax_query;
        }

        $posts = get_posts( $post_args );

        if ( true == $add_to_ignore && is_array( $posts ) && ! empty( $posts ) ) {
            foreach ( $posts as $post ) {
                add_id_to_global_ignore( $post );
            }
        }

        // @TODO: maybe return IDs only or immediately transients
        if ( ! empty( $posts ) ) {
            return $posts;
        }

        return [];

    }

}