Add a custom field type called "genre" to WordPress.

functions.php

<?php // Add Custom Field Type: Genre

function genre_meta_box() {
  add_meta_box(
    'global-notice',
    __( 'Genre', 'sitepoint' ),
    'genre_meta_box_callback',
    'movies',
    'side',
    'low'
  );
}

function genre_meta_box_callback() {
  global $post;
  $custom = get_post_custom($post->ID);
  $genre = $custom["genre"][0];
  ?>
  <input style="width:100%" name="genre" value="<?php 
  echo $genre; ?>" />
  <?php
}

function save_genre(){
  global $post;
  update_post_meta($post->ID, "genre", 
  $_POST["genre"]);
}

add_action( 'add_meta_boxes', 'genre_meta_box' );
add_action( 'save_post', 'save_genre' );

Why does this have printer_category? Was this a copy and paste from somewhere else?

Why does this have printer_category? Was this a copy and paste from somewhere else?

@phoydar I adapted this gist from one of my real-world projects, so left "printer_category" in there by accident!

I've replaced it with "genre"!