Register a post type in WordPress

posttype.php

<?php
//* This file adds the custom post type to our testimonials plugin with a taxonomy and custom meta box options.
/**
 * Create testimonials custom post type.
 *
 * Registers the testimonial custom post type.
 *
 * @see register_post_type
 */
add_action( 'init', 'fcwp_testimonials_post_type' );
function fcwp_testimonials_post_type() {
    $labels = array(
		'name'               => _x( 'Testimonials', 'post type general name', 'fcwp-testimonials' ),
		'singular_name'      => _x( 'Testimonial', 'post type singular name', 'fcwp-testimonials' ),
		'menu_name'          => _x( 'Testimonials', 'admin menu', 'fcwp-testimonials' ),
		'name_admin_bar'     => _x( 'Testimonial', 'add new on admin bar', 'fcwp-testimonials' ),
		'add_new'            => _x( 'Add New', 'testimonial', 'fcwp-testimonials' ),
		'add_new_item'       => __( 'Add New Testimonial', 'fcwp-testimonials' ),
		'new_item'           => __( 'New Testimonial', 'fcwp-testimonials' ),
		'edit_item'          => __( 'Edit Testimonial', 'fcwp-testimonials' ),
		'view_item'          => __( 'View Testimonial', 'fcwp-testimonials' ),
		'all_items'          => __( 'All Testimonials', 'fcwp-testimonials' ),
		'search_items'       => __( 'Search Testimonials', 'fcwp-testimonials' ),
		'parent_item_colon'  => __( 'Parent Testimonials:', 'fcwp-testimonials' ),
		'not_found'          => __( 'No testimonials found.', 'fcwp-testimonials' ),
		'not_found_in_trash' => __( 'No testimonials found in Trash.', 'fcwp-testimonials' )
	);
	$args = array(
		'labels' 		=> $labels,
        'has_archive' 	=> true,
        'public' 		=> true,
        'rewrite' 		=> array( 'slug' => 'testimonial' ),
        'supports' 		=> array( 'title', 'editor', 'excerpt', 'thumbnail' ),
        'menu_position' => 5,
        'menu_icon'     => 'dashicons-testimonial',
	);
    register_post_type( 'testimonial', $args );
}