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