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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.
| Line | Code | 
|---|---|
| 1052 |  | 
| 1053 |      $cats = get_categories(array('type' => 'link', 'orderby' => $order, 'order' => $direction, 'hierarchical' => 0)); | 
| 1054 |  | 
| 1055 |      // Display each category. | 
| 1056 |      if ( $cats ) { | 
| 1057 |           foreach ( (array) $cats as $cat ) { | 
| 1058 |                // Handle each category. | 
| 1059 |  | 
| 1060 |                // Display the category name. | 
| 1061 |                echo '  <li id="linkcat-' . $cat->term_id . '" class="linkcat"><h2>' . apply_filters('link_category', $cat->name ) . "</h2>\n\t<ul>\n"; | 
| 1062 |                // Call get_links() with all the appropriate params. | 
| 1063 |                get_links($cat->term_id, '<li>', "</li>", "\n", true, 'name', false); | 
| 1064 |  | 
| 1065 |                // Close the last category. | 
| 1066 |                echo "\n\t</ul>\n</li>\n"; | 
| 1067 |           } | 
| 1068 |      } | 
| 1069 | } | 
| 1070 |  |