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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 |
|---|---|
| 88 | /** |
| 89 | * Filters the array of categories to return for a post. |
| 90 | * |
| 91 | * @since 3.1.0 |
| 92 | * @since 4.4.0 Added `$id` parameter. |
| 93 | * |
| 94 | * @param WP_Term[] $categories An array of categories to return for the post. |
| 95 | * @param int|false $id ID of the post. |
| 96 | */ |
| 97 | return apply_filters( 'get_the_categories', $categories, $id ); |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Retrieve category name based on category ID. |
| 102 | * |
| 103 | * @since 0.71 |
| 104 | * |
| 105 | * @param int $cat_ID Category ID. |
| 106 | * @return string|WP_Error Category name on success, WP_Error on failure. |