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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 |
|---|---|
| 27 | $r['orderby'] = 'category_count'; |
| 28 | else |
| 29 | $r['orderby'] = "cat_" . $r['orderby']; // restricts order by to cat_ID and cat_name fields |
| 30 | $r['number'] = (int) $r['number']; |
| 31 | extract($r); |
| 32 | |
| 33 | $key = md5( serialize( $r ) ); |
| 34 | if ( $cache = wp_cache_get( 'get_categories', 'category' ) ) |
| 35 | if ( isset( $cache[ $key ] ) ) |
| 36 | return apply_filters('get_categories', $cache[$key], $r); |
| 37 | |
| 38 | $where = 'cat_ID > 0'; |
| 39 | $inclusions = ''; |
| 40 | if ( !empty($include) ) { |
| 41 | $child_of = 0; //ignore child_of and exclude params if using include |
| 42 | $exclude = ''; |
| 43 | $incategories = preg_split('/[\s,]+/',$include); |
| 44 | if ( count($incategories) ) { |
| 45 | foreach ( $incategories as $incat ) { |
| Line | Code |
| 128 | unset($categories[$k]); |
| 129 | } |
| 130 | } |
| 131 | } |
| 132 | reset ( $categories ); |
| 133 | |
| 134 | $cache[ $key ] = $categories; |
| 135 | wp_cache_add( 'get_categories', $cache, 'category' ); |
| 136 | |
| 137 | $categories = apply_filters('get_categories', $categories, $r); |
| 138 | return $categories; |
| 139 | } |
| 140 | |
| 141 | // Retrieves category data given a category ID or category object. |
| 142 | // Handles category caching. |
| 143 | function &get_category(&$category, $output = OBJECT) { |
| 144 | global $wpdb; |
| 145 | |
| 146 | if ( empty($category) ) |