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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 |
|---|---|
| 2217 | |
| 2218 | /** |
| 2219 | * Filter the default array of block categories. |
| 2220 | * |
| 2221 | * @since 5.0.0 |
| 2222 | * |
| 2223 | * @param array[] $default_categories Array of block categories. |
| 2224 | * @param WP_Post $post Post being loaded. |
| 2225 | */ |
| 2226 | return apply_filters( 'block_categories', $default_categories, $post ); |
| 2227 | } |
| 2228 | |
| 2229 | /** |
| 2230 | * Prepares server-registered blocks for the block editor. |
| 2231 | * |
| 2232 | * Returns an associative array of registered block data keyed by block name. Data includes properties |
| 2233 | * of a block relevant for client registration. |
| 2234 | * |
| 2235 | * @since 5.0.0 |