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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 |
|---|---|
| 1994 | |
| 1995 | /** |
| 1996 | * Filter the default array of block categories. |
| 1997 | * |
| 1998 | * @since 5.0.0 |
| 1999 | * |
| 2000 | * @param array $default_categories Array of block categories. |
| 2001 | * @param WP_Post $post Post being loaded. |
| 2002 | */ |
| 2003 | return apply_filters( 'block_categories', $default_categories, $post ); |
| 2004 | } |
| 2005 | |
| 2006 | /** |
| 2007 | * Prepares server-registered blocks for the block editor. |
| 2008 | * |
| 2009 | * Returns an associative array of registered block data keyed by block name. Data includes properties |
| 2010 | * of a block relevant for client registration. |
| 2011 | * |
| 2012 | * @since 5.0.0 |