Register post type helper class

Post_Type.php

<?php

///////////////////////////////////////////////////////////////////////////////////
// Please use within a namespace, or change this helper class name.              //
// Don't forget to properly prefix the apply_filters() calls made throughout.    //
//                                                                               //
// Example usage:                                                                //
//                                                                               //
// new Post_Type( 'book', 'Book', 'Books' );                                     //
// new Post_Type( 'video', 'Video', 'Videos', array( 'has_archive' => false ) ); //
///////////////////////////////////////////////////////////////////////////////////

class Post_Type {

	/**
	 * Post type name/slug
	 *
	 * @var string
	 */
	protected $name;

	/**
	 * Post type singular label
	 *
	 * @var string
	 */
	protected $singular;

	/**
	 * Post type plural label
	 *
	 * @var string
	 */
	protected $plural;

	/**
	 * Post type args
	 *
	 * @var array
	 */
	protected $args = array();

	/**
	 * Class constructor
	 *
	 * @param string $name
	 * @param string $singular (optional) Defaults to $name
	 * @param string $plural   (optional) Defaults to $name
	 * @param array  $args     (optional)
	 */
	public function __construct( $name, $singular = null, $plural = null, $args = array() ) {
		$this->name     = sanitize_key( $name );
		$this->singular = ! empty( $singular ) ? $singular : $name;
		$this->plural   = ! empty( $plural ) ? $plural : $name;
		$this->args     = $this->get_args( (array) $args );

		add_action( 'init', function() {
			register_post_type( $this->name, $this->args );
		} );
	}

	/**
	 * Get post type args
	 *
	 * @param  array $args
	 *
	 * @return array
	 */
	private function get_args( $args ) {
		/**
		 * Filter the default args used for post types
		 *
		 * @param array $default_args
		 */
		$defaults = (array) apply_filters( 'myprefix_post_type_default_args',
			array(
				'public'             => true,
				'publicly_queryable' => true,
				'show_ui'            => true,
				'show_in_menu'       => true,
				'query_var'          => true,
				'rewrite'            => array( 'slug' => sanitize_key( $this->plural ) ),
				'capability_type'    => 'post',
				'has_archive'        => true,
				'hierarchical'       => false,
				'menu_position'      => null,
				'supports'           => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments' ),
				'labels'             => array(
					'name'               => $this->plural,
					'singular_name'      => $this->singular,
					'menu_name'          => $this->plural,
					'name_admin_bar'     => $this->singular,
					'add_new'            => _x( 'Add New', $this->name, 'text-domain' ),
					'add_new_item'       => sprintf( __( 'Add New %s', 'text-domain' ), $this->singular ),
					'new_item'           => sprintf( __( 'New %s', 'text-domain' ), $this->singular ),
					'edit_item'          => sprintf( __( 'Edit %s', 'text-domain' ), $this->singular ),
					'view_item'          => sprintf( __( 'View %s', 'text-domain' ), $this->singular ),
					'all_items'          => sprintf( __( 'All %s', 'text-domain' ), $this->plural ),
					'search_items'       => sprintf( __( 'Search %s', 'text-domain' ), $this->plural ),
					'parent_item_colon'  => sprintf( __( 'Parent %s:', 'text-domain' ), $this->plural ),
					'not_found'          => sprintf( __( 'No %s found', 'text-domain' ), mb_strtolower( $this->plural ) ),
					'not_found_in_trash' => sprintf( __( 'No %s found in Trash', 'text-domain' ), mb_strtolower( $this->plural ) ),
				),
			)
		);

		/**
		 * Filter the args for a given post type
		 *
		 * @param array $args
		 */
		return (array) apply_filters( "myprefix_{$this->name}_post_type_args", self::assoc_array_merge_recursive( $defaults, $args ) );
	}

	/**
	 * Recursively merge two or more associative arrays and preserve all keys
	 *
	 * @param  array $array1
	 * @param  array $array2
	 * @param  array $...
	 *
	 * @return array
	 */
	public static function assoc_array_merge_recursive( array $array1, array $array2 ) {
		$result = array();

		for ( $i = 0, $total = func_num_args(); $i < $total; $i++ ) {
			$_array   = func_get_arg( $i );
			$is_assoc = self::is_accoc_array( $_array );

			foreach ( $_array as $key => &$value ) {
				if ( is_array( $value ) && isset( $result[ $key ] ) && is_array( $result[ $key ] ) ) {
					$result[ $key ] = self::assoc_array_merge_recursive( $result[ $key ], $value );

					continue;
				}

				if ( ! $is_assoc && ! in_array( $value, $merged, true ) ) {
					$result[] = $value;

					continue;
				}

				$result[ $key ] = $value;
			}
		}

		return (array) $result;
	}

	/**
	 * Determine if an array is associative
	 *
	 * @param  array $array
	 *
	 * @return bool
	 */
	public static function is_accoc_array( array $array ) {
		return ( array_keys( $array ) !== range( 0, count( $array ) - 1 ) );
	}

}