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