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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 2 times in this file.
| Line | Code |
|---|---|
| 87 | $cat_ID = (int) $cat_ID; |
| 88 | $category = &get_category($cat_ID); |
| 89 | return $category->cat_name; |
| 90 | } |
| 91 | |
| 92 | function get_the_category_list($separator = '', $parents='') { |
| 93 | global $wp_rewrite; |
| 94 | $categories = get_the_category(); |
| 95 | if (empty($categories)) |
| 96 | return apply_filters('the_category', __('Uncategorized'), $separator, $parents); |
| 97 | |
| 98 | $rel = ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() ) ? 'rel="category tag"' : 'rel="category"'; |
| 99 | |
| 100 | $thelist = ''; |
| 101 | if ( '' == $separator ) { |
| 102 | $thelist .= '<ul class="post-categories">'; |
| 103 | foreach ( $categories as $category ) { |
| 104 | $thelist .= "\n\t<li>"; |
| 105 | switch ( strtolower($parents) ) { |
| Line | Code |
| 138 | $thelist .= "$category->cat_name</a>"; |
| 139 | break; |
| 140 | case '': |
| 141 | default: |
| 142 | $thelist .= '<a href="' . get_category_link($category->cat_ID) . '" title="' . sprintf(__("View all posts in %s"), $category->cat_name) . '" ' . $rel . '>' . $category->cat_name.'</a>'; |
| 143 | } |
| 144 | ++$i; |
| 145 | } |
| 146 | } |
| 147 | return apply_filters('the_category', $thelist, $separator, $parents); |
| 148 | } |
| 149 | |
| 150 | function in_category($category) { // Check if the current post is in the given category |
| 151 | global $category_cache, $post, $blog_id; |
| 152 | |
| 153 | if ( isset( $category_cache[$blog_id][$post->ID][$category] ) ) |
| 154 | return true; |
| 155 | else |
| 156 | return false; |