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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 |
|---|---|
| 2173 | |
| 2174 | /** |
| 2175 | * Filter the default array of block categories. |
| 2176 | * |
| 2177 | * @since 5.0.0 |
| 2178 | * |
| 2179 | * @param array $default_categories Array of block categories. |
| 2180 | * @param WP_Post $post Post being loaded. |
| 2181 | */ |
| 2182 | return apply_filters( 'block_categories', $default_categories, $post ); |
| 2183 | } |
| 2184 | |
| 2185 | /** |
| 2186 | * Prepares server-registered blocks for the block editor. |
| 2187 | * |
| 2188 | * Returns an associative array of registered block data keyed by block name. Data includes properties |
| 2189 | * of a block relevant for client registration. |
| 2190 | * |
| 2191 | * @since 5.0.0 |