Wordpress Chained Class to register post type

post-type.php

<?php
namespace sejoli;

Class PostType
{
    protected static $labels     = [];
    protected static $args      = [];
    protected static $post_type = '';
    protected static $valid     = true;
    protected static $exists    = true;
    protected static $respond   = [];

    /**
     * Set post type label
     * @param array $label
     */
    static public function set_labels(array $labels)
    {
        self::$labels    = $labels;
        return new static;
    }

    /**
     * Set post type arguments
     * @param array $args
     */
    static public function set_args(array $args)
    {
        $defaults = [
            'label'               => '',
            'description'         => '',
            'labels'              => self::$labels,
            'supports'            => ['title', 'editor'],
            'hierarchical'        => false,
            'public'              => true,
            'show_ui'             => true,
            'show_in_menu'        => true,
            'show_in_nav_menus'   => true,
            'show_in_admin_bar'   => true,
            'can_export'          => true,
            'has_archive'         => true,
            'exclude_from_search' => true,
            'publicly_queryable'  => true,
            'capability_type'     => 'post',
        ];

        self::$args     = wp_parse_args($args,$defaults);

        return new static;
    }

    /**
     * Set post type key
     * @param string $post_type
     */
    static public function set_post_type($post_type)
    {
        if(!$post_type || empty($post_type)) :
            self::$valid    = false;
            self::$respond['message'][] = __('Post type is not set','sejoli');
        elseif(!is_string($post_type)) :
            self::$valid    = false;
            self::$respond['message'][] = __('Post type is not string type','sejoli');
        else :
            self::$post_type = $post_type;
        endif;
        return new static;
    }

    /**
     * Validating post type arguments
     */
    static protected function validate()
    {
        // make sure again
        // check if user bypass the process set
        if(true === self::$valid) :
            self::set_post_type(self::$post_type);
        endif;
    }

    /**
     * Check if current post type exists
     */
    static protected function exists()
    {
        if(!post_type_exists(self::$post_type)) :
            self::$exists   = false;
        endif;
    }

    /**
     * Flush rewrite rules
     */
    static protected function flush()
    {
        if(false === self::$exists) :
            flush_rewrite_rules(true);
        endif;
    }

    /**
     * Register the post type
     */
    static public function register()
    {
        self::validate();

        if(true === self::$valid) :
            self::$args['labels']    = self::$labels;
            register_post_type(self::$post_type,self::$args);
            self::flush();
            self::$respond['message'][] = sprintf(__('Post type %s registered','sejoli'),self::$post_type);
        endif;

        return new static;
    }

    /**
     * Return the respond
     * @return array
     */
    static public function respond()
    {
        self::$respond['valid'] = self::$valid;
        return self::$respond;
    }
}

Example

$respond = \sejoli\PostType::set_labels($labels)
->set_args($args)
->set_post_type('affiliate')
->register()
->respond();