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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 |
|---|---|
| 337 | foreach ( $cat_names as $cat_name ) { |
| 338 | if ( 'rdf' == $type ) |
| 339 | $the_list .= "\t\t<dc:subject><![CDATA[$cat_name]]></dc:subject>\n"; |
| 340 | elseif ( 'atom' == $type ) |
| 341 | $the_list .= sprintf( '<category scheme="%1$s" term="%2$s" />', esc_attr( apply_filters( 'get_bloginfo_rss', get_bloginfo( 'url' ) ) ), esc_attr( $cat_name ) ); |
| 342 | else |
| 343 | $the_list .= "\t\t<category><![CDATA[" . @html_entity_decode( $cat_name, ENT_COMPAT, get_option('blog_charset') ) . "]]></category>\n"; |
| 344 | } |
| 345 | |
| 346 | return apply_filters('the_category_rss', $the_list, $type); |
| 347 | } |
| 348 | |
| 349 | /** |
| 350 | * Display the post categories in the feed. |
| 351 | * |
| 352 | * @package WordPress |
| 353 | * @subpackage Feed |
| 354 | * @since 0.71 |
| 355 | * @see get_the_category_rss() For better explanation. |