One of two Custom Post types not being registered

Question

I have this function that adds to custom post types which is very simple and straight forward as seen below;

function create_hr_post_type() {

  register_post_type( 'informationtechnology',
    array(
      'labels' => array(
        'name' => __( 'Information Technology' ),
        'singular_name' => __( 'Information Technology' )
      ),
      'public' => true,
      'has_archive' => true,
      'rewrite' => array('slug' => 'informationtechnology'),
    )
  );

  register_post_type( 'humanresource',
    array(
      'labels' => array(
        'name' => __( 'HR' ),
        'singular_name' => __( 'HR' )
      ),
      'public' => true,
      'has_archive' => true,
      'rewrite' => array('slug' => 'humanresource'),
    )
  );


}

add_action( 'init', 'create_hr_post_type' );

However, only one post type is being registered on checking my admin left bar. I only see the the HR post type! What is going on in here? What i'm i missing?

I have tried reordering the code so that the IT type comes first but still doesn't work.

Answer 1

An important notice from the Codex:

Do pay close attention to not having your custom post type identifier exceed 20 characters though, as the post_type column in the database is currently a VARCHAR field of that length.

Please check out:

echo strlen( 'informationtechnology' );

If you have WP_DEBUG activated, then you will see this warning:

register_post_type was called incorrectly. Post type names must be between 1 and 20 characters in length. Please see Debugging in WordPress for more information. (This message was added in version 4.2.)

so this is a good reminder to use it when developing your site ;-)

This part of register_post_type() is responsible for this check, I missed it when I first skimmed through the function but confirmed it when I ran the example by @JoeyNg'ethe:

if ( empty( $post_type ) || strlen( $post_type ) > 20 ) {
    _doing_it_wrong(
        __FUNCTION__, 
        __( 'Post type names must be between 1 and 20 characters in length.' ), 
       '4.2' 
    );
    return new WP_Error( 
        'post_type_length_invalid',
        __( 'Post type names must be between 1 and 20 characters in length.' ) 
    );
}

EDIT

Look at the $post_type parameter when registering your post type

$post_type

(string) (required) Post type. (max. 20 characters, cannot contain capital letters or spaces)

Default: None