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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 |
|---|---|
| 108 | if ( is_array( $cats ) ) { |
| 109 | foreach ( $cats as $cat) { |
| 110 | $result[$cat]['children'] = get_nested_categories( $default, $cat); |
| 111 | $result[$cat]['cat_ID'] = $cat; |
| 112 | $result[$cat]['checked'] = in_array( $cat, $checked_categories ); |
| 113 | $result[$cat]['cat_name'] = get_the_category_by_ID( $cat); |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | $result = apply_filters('get_nested_categories', $result); |
| 118 | usort( $result, 'sort_cats' ); |
| 119 | |
| 120 | return $result; |
| 121 | } |
| 122 | |
| 123 | function write_nested_categories( $categories ) { |
| 124 | foreach ( $categories as $category ) { |
| 125 | echo '<li id="category-', $category['cat_ID'], '"><label for="in-category-', $category['cat_ID'], '" class="selectit"><input value="', $category['cat_ID'], '" type="checkbox" name="post_category[]" id="in-category-', $category['cat_ID'], '"', ($category['checked'] ? ' checked="checked"' : "" ), '/> ', wp_specialchars( apply_filters('the_category', $category['cat_name'] )), "</label></li>"; |
| 126 | |