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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 3 times in this file.
| Line | Code | 
|---|---|
| 74 |           if ( empty($taxonomy) ) | 
| 75 |                $taxonomy = 'category'; | 
| 76 |  | 
| 77 |           if ( $taxonomy == 'category' ) | 
| 78 |                $name = 'post_category'; | 
| 79 |           else | 
| 80 |                $name = 'tax_input['.$taxonomy.']'; | 
| 81 |  | 
| 82 |           $class = in_array( $category->term_id, $popular_cats ) ? ' class="popular-category"' : ''; | 
| 83 |           $output .= "\n<li id='{$taxonomy}-{$category->term_id}'$class>" . '<label class="selectit"><input value="' . $category->term_id . '" type="checkbox" name="'.$name.'[]" id="in-'.$taxonomy.'-' . $category->term_id . '"' . checked( in_array( $category->term_id, $selected_cats ), true, false ) . disabled( empty( $args['disabled'] ), false, false ) . ' /> ' . esc_html( apply_filters('the_category', $category->name )) . '</label>'; | 
| 84 |      } | 
| 85 |  | 
| 86 |      /** | 
| 87 |       * Ends the element output, if needed. | 
| 88 |       * | 
| 89 |       * @see Walker::end_el() | 
| 90 |       * | 
| 91 |       * @since 2.5.1 | 
| 92 |       * | 
| Line | Code | 
| 230 |           if ( !$echo ) // hack for AJAX use | 
| 231 |                continue; | 
| 232 |           $id = "popular-$taxonomy-$term->term_id"; | 
| 233 |           $checked = in_array( $term->term_id, $checked_terms ) ? 'checked="checked"' : ''; | 
| 234 |           ?> | 
| 235 |  | 
| 236 |           <li id="<?php echo $id; ?>" class="popular-category"> | 
| 237 |                <label class="selectit"> | 
| 238 |                <input id="in-<?php echo $id; ?>" type="checkbox" <?php echo $checked; ?> value="<?php echo (int) $term->term_id; ?>" <?php disabled( ! current_user_can( $tax->cap->assign_terms ) ); ?> /> | 
| 239 |                     <?php echo esc_html( apply_filters( 'the_category', $term->name ) ); ?> | 
| 240 |                </label> | 
| 241 |           </li> | 
| 242 |  | 
| 243 |           <?php | 
| 244 |      } | 
| 245 |      return $popular_ids; | 
| 246 | } | 
| 247 |  | 
| 248 | /** | 
| Line | Code | 
| 265 |      } | 
| 266 |  | 
| 267 |      $categories = get_terms( 'link_category', array( 'orderby' => 'name', 'hide_empty' => 0 ) ); | 
| 268 |  | 
| 269 |      if ( empty( $categories ) ) | 
| 270 |           return; | 
| 271 |  | 
| 272 |      foreach ( $categories as $category ) { | 
| 273 |           $cat_id = $category->term_id; | 
| 274 |           $name = esc_html( apply_filters( 'the_category', $category->name ) ); | 
| 275 |           $checked = in_array( $cat_id, $checked_categories ) ? ' checked="checked"' : ''; | 
| 276 |           echo '<li id="link-category-', $cat_id, '"><label for="in-link-category-', $cat_id, '" class="selectit"><input value="', $cat_id, '" type="checkbox" name="link_category[]" id="in-link-category-', $cat_id, '"', $checked, '/> ', $name, "</label></li>"; | 
| 277 |      } | 
| 278 | } | 
| 279 |  | 
| 280 | // adds hidden fields with the data for use in the inline editor for posts and pages | 
| 281 | /** | 
| 282 |  * {@internal Missing Short Description}} | 
| 283 |  * |