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    copied!<p>Use a modified version of <code>post_categories_meta_box</code>, in which you change the call to <code>wp_category_checklist</code> to a modified version, <code>wp_category_checklist_modified</code>. </p> <p><strong>post_categories_meta_box_modified</strong>:</p> <pre><code>function post_categories_meta_box_modified($post) { ?&gt; &lt;ul id="category-tabs"&gt; &lt;li class="ui-tabs-selected"&gt;&lt;a href="#categories-all" tabindex="3"&gt;&lt;?php _e( 'All Categories' ); ?&gt;&lt;/a&gt;&lt;/li&gt; &lt;li class="hide-if-no-js"&gt;&lt;a href="#categories-pop" tabindex="3"&gt;&lt;?php _e( 'Most Used' ); ?&gt;&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;div id="categories-pop" class="ui-tabs-panel" style="display: none;"&gt; &lt;ul id="categorychecklist-pop" class="categorychecklist form-no-clear" &gt; &lt;?php $popular_ids = wp_popular_terms_checklist('category'); ?&gt; &lt;/ul&gt; &lt;/div&gt; &lt;div id="categories-all" class="ui-tabs-panel"&gt; &lt;ul id="categorychecklist" class="list:category categorychecklist form-no-clear"&gt; &lt;?php wp_category_checklist($post-&gt;ID, false, array($cat1_id, $cat2_id.... ,$catn_id), $popular_ids) ?&gt; &lt;/ul&gt; &lt;/div&gt; &lt;?php if ( current_user_can('manage_categories') ) : ?&gt; &lt;div id="category-adder" class="wp-hidden-children"&gt; &lt;h4&gt;&lt;a id="category-add-toggle" href="#category-add" class="hide-if-no-js" tabindex="3"&gt;&lt;?php _e( '+ Add New Category' ); ?&gt;&lt;/a&gt;&lt;/h4&gt; &lt;p id="category-add" class="wp-hidden-child"&gt; &lt;label class="hidden" for="newcat"&gt;&lt;?php _e( 'Add New Category' ); ?&gt;&lt;/label&gt;&lt;input type="text" name="newcat" id="newcat" class="form-required form-input-tip" value="&lt;?php _e( 'New category name' ); ?&gt;" tabindex="3" aria-required="true"/&gt; &lt;label class="hidden" for="newcat_parent"&gt;&lt;?php _e('Parent category'); ?&gt;:&lt;/label&gt;&lt;?php wp_dropdown_categories( array( 'hide_empty' =&gt; 0, 'name' =&gt; 'newcat_parent', 'orderby' =&gt; 'name', 'hierarchical' =&gt; 1, 'show_option_none' =&gt; __('Parent category'), 'tab_index' =&gt; 3 ) ); ?&gt; &lt;input type="button" id="category-add-sumbit" class="add:categorychecklist:category-add button" value="&lt;?php _e( 'Add' ); ?&gt;" tabindex="3" /&gt; &lt;?php wp_nonce_field( 'add-category', '_ajax_nonce', false ); ?&gt; &lt;span id="category-ajax-response"&gt;&lt;/span&gt; &lt;/p&gt; &lt;/div&gt; &lt;?php endif; } </code></pre> <p>I've only change the line of the original function</p> <pre><code>&lt;?php wp_category_checklist($post-&gt;ID, false, false, $popular_ids) ?&gt; </code></pre> <p>to</p> <pre><code>&lt;?php wp_category_checklist_modified($post-&gt;ID, false, false, $popular_ids) ?&gt; </code></pre> <p><strong>wp_category_checklist_modified:</strong></p> <pre><code>function wp_category_checklist_modified( $post_id = 0, $descendants_and_self = 0, $selected_cats = false, $popular_cats = false, $include_cats = array() ) { $walker = new Walker_Category_Checklist; $descendants_and_self = (int) $descendants_and_self; $cat_ids_list = implode(',', $include_cats); $args = array(); if ( is_array( $selected_cats ) ) $args['selected_cats'] = $selected_cats; elseif ( $post_id ) $args['selected_cats'] = wp_get_post_categories($post_id); else $args['selected_cats'] = array(); if ( is_array( $popular_cats ) ) $args['popular_cats'] = $popular_cats; else $args['popular_cats'] = get_terms( 'category', array( 'fields' =&gt; 'ids', 'orderby' =&gt; 'count', 'order' =&gt; 'DESC', 'number' =&gt; 10, 'hierarchical' =&gt; false ) ); if ( $descendants_and_self ) { $categories = get_categories( "child_of=$descendants_and_self&amp;hierarchical=0&amp;hide_empty=0&amp;include=$cat_ids_list" ); $self = get_category( $descendants_and_self ); array_unshift( $categories, $self ); } else { $categories = get_categories('get=all&amp;include='. $cat_ids_list); } // Post process $categories rather than adding an exclude to the get_terms() query to keep the query the same across all posts (for any query cache) $checked_categories = array(); for ( $i = 0; isset($categories[$i]); $i++ ) { if ( in_array($categories[$i]-&gt;term_id, $args['selected_cats']) ) { $checked_categories[] = $categories[$i]; unset($categories[$i]); } } // Put checked cats on top echo call_user_func_array(array(&amp;$walker, 'walk'), array($checked_categories, 0, $args)); // Then the rest of them echo call_user_func_array(array(&amp;$walker, 'walk'), array($categories, 0, $args)); } </code></pre> <p>Here I've added an extra argument to <code>wp_category_checklist_modified</code>, <code>$include_cats</code>, in which you can specify the categories ids, then I use this list in the two calls to <code>get_categories</code> passing it as the <code>include</code> parameter.</p> <p>These functions are not documented (as much as I am be able to find), so I've had to take a look to the source code.</p> <p>Then you will simply use</p> <pre><code>function my_post_categories_meta_box() { add_meta_box('categorydiv', __('Categories'), 'post_categories_meta_box_modified', 'page', 'side', 'core'); } </code></pre> <p>Hope this helps.</p>
 

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