Unregisters a post type and removes the menu item

gistfile1.php

<?php

/*
 * Usage for a custom post type named 'movies':
 * unregister_post_type( 'movies' );
 *
 * Usage for the built in 'post' post type:
 * unregister_post_type( 'post', 'edit.php' );
*/
function unregister_post_type( $post_type, $slug = '' ){
	
	global $wp_post_types;
	
	if ( isset( $wp_post_types[ $post_type ] ) ) {
            unset( $wp_post_types[ $post_type ] );
        	
            $slug = ( !$slug ) ? 'edit.php?post_type=' . $post_type : $slug;
            remove_menu_page( $slug );
	}
}
?>