WordPress 自定义后台发布文章时的分类目录

// remove the old box
function remove_default_categories_box() {
 remove_meta_box('categorydiv', 'post', 'side');
}
add_action( 'admin_head', 'remove_default_categories_box' );

// add the new box
function add_custom_categories_box() {
 add_meta_box('customcategorydiv', 'Categories', 'custom_post_categories_meta_box', 'post', 'side', 'low', array( 'taxonomy' => 'category' ));
}
add_action('admin_menu', 'add_custom_categories_box');

/**
 * Display CUSTOM post categories form fields.
 *
 * @since 2.6.0
 *
 * @param object $post
 */
function custom_post_categories_meta_box( $post, $box ) {
 $defaults = array('taxonomy' => 'category');
 if ( !isset($box['args']) || !is_array($box['args']) )
 $args = array();
 else
 $args = $box['args'];
 extract( wp_parse_args($args, $defaults), EXTR_SKIP );
 $tax = get_taxonomy($taxonomy);

?>
 <div id="taxonomy-<?php echo $taxonomy; ?>" class="categorydiv">
 <ul id="<?php echo $taxonomy; ?>-tabs" class="category-tabs">
 <li class="tabs"><a href="#<?php echo $taxonomy; ?>-all" tabindex="3"><?php echo $tax->labels->all_items; ?></a></li>
 <li class="hide-if-no-js"><a href="#<?php echo $taxonomy; ?>-pop" tabindex="3"><?php _e( 'Most Used' ); ?></a></li>
 </ul>

<div id="<?php echo $taxonomy; ?>-pop" class="tabs-panel" style="display: none;">
 <ul id="<?php echo $taxonomy; ?>checklist-pop" class="categorychecklist form-no-clear" >
 <?php $popular_ids = wp_popular_terms_checklist($taxonomy); ?>
 </ul>
 </div>

<div id="<?php echo $taxonomy; ?>-all" class="tabs-panel">
 <?php
 $name = ( $taxonomy == 'category' ) ? 'post_category' : 'tax_input[' . $taxonomy . ']';
 echo "<input type='hidden' name='{$name}[]' value='0' />"; // Allows for an empty term set to be sent. 0 is an invalid Term ID and will be ignored by empty() checks.
 ?>
 <ul id="<?php echo $taxonomy; ?>checklist" class="list:<?php echo $taxonomy?> categorychecklist form-no-clear">
 <?php 
 /**
 * This is the one line we had to change in the original function
 * Notice that "checked_ontop" is now set to FALSE
 */
 wp_terms_checklist($post->ID, array( 'taxonomy' => $taxonomy, 'popular_cats' => $popular_ids, 'checked_ontop' => FALSE ) ) ?>
 </ul>
 </div>
 <?php if ( !current_user_can($tax->cap->assign_terms) ) : ?>
 <p><em><?php _e('You cannot modify this taxonomy.'); ?></em></p>
 <?php endif; ?>
 <?php if ( current_user_can($tax->cap->edit_terms) ) : ?>
 <div id="<?php echo $taxonomy; ?>-adder" class="wp-hidden-children">
 <h4>
 <a id="<?php echo $taxonomy; ?>-add-toggle" href="#<?php echo $taxonomy; ?>-add" class="hide-if-no-js" tabindex="3">
 <?php
 /* translators: %s: add new taxonomy label */
 printf( __( '+ %s' ), $tax->labels->add_new_item );
 ?>
 </a>
 </h4>
 <p id="<?php echo $taxonomy; ?>-add" class="category-add wp-hidden-child">
 <label class="screen-reader-text" for="new<?php echo $taxonomy; ?>"><?php echo $tax->labels->add_new_item; ?></label>
 <input type="text" name="new<?php echo $taxonomy; ?>" id="new<?php echo $taxonomy; ?>" class="form-required form-input-tip" value="<?php echo esc_attr( $tax->labels->new_item_name ); ?>" tabindex="3" aria-required="true"/>
 <label class="screen-reader-text" for="new<?php echo $taxonomy; ?>_parent">
 <?php echo $tax->labels->parent_item_colon; ?>
 </label>
 <?php wp_dropdown_categories( array( 'taxonomy' => $taxonomy, 'hide_empty' => 0, 'name' => 'new'.$taxonomy.'_parent', 'orderby' => 'name', 'hierarchical' => 1, 'show_option_none' => '&mdash; ' . $tax->labels->parent_item . ' &mdash;', 'tab_index' => 3 ) ); ?>
 <input type="button" id="<?php echo $taxonomy; ?>-add-submit" class="add:<?php echo $taxonomy ?>checklist:<?php echo $taxonomy ?>-add button category-add-sumbit" value="<?php echo esc_attr( $tax->labels->add_new_item ); ?>" tabindex="3" />
 <?php wp_nonce_field( 'add-'.$taxonomy, '_ajax_nonce-add-'.$taxonomy, false ); ?>
 <span id="<?php echo $taxonomy; ?>-ajax-response"></span>
 </p>
 </div>
 <?php endif; ?>
 </div>
 <?php
}

来自 http://stackoverflow.com/questions/4830913/wordpress-category-list-order-in-post-edit-page