WordPress Custom Post Type Plugin Template

customtype.php

<?php
/*
Plugin Name: CustomType
Plugin URI: 
Author: Craig Hooghiem
Author URI: http://www.craighooghiem.com
Description: A custom post type that adds CustomType and custom taxonomies.
Version: 1.0
*/

new CustomType;		// Initial call

class CustomType {
	
  var $single = "CustomType"; 	// this represents the singular name of the post type
  var $plural = "CustomTypes"; 	// this represents the plural name of the post type
  var $type 	= "customtype"; 	// this is the actual type

	# credit: http://w3prodigy.com/behind-wordpress/php-classes-wordpress-plugin/
	function CustomType()
	{
		$this->__construct();
	}

	function __construct()
	{
		# Place your add_actions and add_filters here
		add_action( 'init', array( &$this, 'init' ) );
		add_action('init', array(&$this, 'add_post_type'));
		
		# Add image support 
		add_theme_support('post-thumbnails', array( $this->type ) );
		add_image_size(strtolower($this->plural).'-thumb-s', 220, 160, true);
		add_image_size(strtolower($this->plural).'-thumb-m', 300, 180, true);

		# Add Post Type to Search 
		add_filter('pre_get_posts', array( &$this, 'query_post_type') );

		# Add Custom Taxonomies
		add_action( 'init', array( &$this, 'add_taxonomies'), 0 );

		# Add meta box
		add_action('add_meta_boxes', array( &$this, 'add_custom_metaboxes') );

		# Save entered data
		add_action('save_post', array( &$this, 'save_postdata') );

	} 
	
	# @credit: http://www.wpinsideout.com/advanced-custom-post-types-php-class-integration
  function init($options = null){
  	if($options) {
	    foreach($options as $key => $value){
	      $this->$key = $value;
	    }
    }
  }

	# @credit: http://www.wpinsideout.com/advanced-custom-post-types-php-class-integration
	function add_post_type(){
    $labels = array(
      'name' => _x($this->plural, 'post type general name'),
      'singular_name' => _x($this->single, 'post type singular name'),
      'add_new' => _x('Add ' . $this->single, $this->single),
      'add_new_item' => __('Add New ' . $this->single),
      'edit_item' => __('Edit ' . $this->single),
      'new_item' => __('New ' . $this->single),
      'view_item' => __('View ' . $this->single),
      'search_items' => __('Search ' . $this->plural),
      'not_found' =>  __('No ' . $this->plural . ' Found'),
      'not_found_in_trash' => __('No ' . $this->plural . ' found in Trash'),
      'parent_item_colon' => ''
    );
    $options = array(
      'labels' => $labels,
      'public' => true,
      'publicly_queryable' => true,
      'show_ui' => true,
      'query_var' => true,
      'rewrite' => array('slug' => strtolower($this->plural)),
      'capability_type' => 'post',
      'hierarchical' => false,
      'has_archive' => true,
      'menu_position' => null,
	'menu_icon'   => 'dashicons-products',
      'supports' => array(
      	'title',
      	'editor',
#      	'author',
      	'thumbnail',
#      	'excerpt',
      	'comments'
      ),
    );
    register_post_type($this->type, $options);
  }

	
	function query_post_type($query) {
	  if(is_category() || is_tag()) {
	    $post_type = get_query_var('post_type');
		if($post_type) {
		  $post_type = $post_type;
		} else {
		  $post_type = array($this->type); // replace cpt to your custom post type
	  }
	  $query->set('post_type',$post_type);
		return $query;
	  }
	}

	function add_taxonomies() {
	  
		$labels = array(
			'name' => __( 'Include on Page', 'hmc' ),
			'singular_name' => __( 'Include on Page', 'hmc' ),
			'search_items' => __( 'Search Include on Page', 'hmc' ),
			'popular_items' => __( 'Popular Include on Page', 'hmc' ),
			'all_items' => __( 'All Include on Page', 'hmc' ),
			'parent_item' => __( 'Parent Include on Page', 'hmc' ),
			'parent_item_colon' => __( 'Parent Include on Page:', 'hmc' ),
			'edit_item' => __( 'Edit Include on Page', 'hmc' ),
			'update_item' => __( 'Update Include on Page', 'hmc' ),
			'add_new_item' => __( 'Add New Include on Page', 'hmc' ),
			'new_item_name' => __( 'New Include on Page', 'hmc' ),
			'separate_items_with_commas' => __( 'Separate Include on Page with commas', 'hmc' ),
			'add_or_remove_items' => __( 'Add or remove Include on Page', 'hmc' ),
			'choose_from_most_used' => __( 'Choose from the most used Include on Page', 'hmc' ),
			'menu_name' => __( 'Include on Page', 'hmc' ),
		    );
		    $args = array(
			'labels' => $labels,
			'public' => false, // set to false so your tax terms aren't shown on the front end of your site
			'show_in_nav_menus' => false,
			'show_ui' => true, // set to true so these taxonomy terms appear on post edit screen
			'show_tagcloud' => false,
			'show_admin_column' => false,
			'hierarchical' => false,
			'rewrite' => false,
			'query_var' => true
		    );
		    register_taxonomy( 'include_staff_on_page', array( 'release' ), $args );

	}

}