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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 |
|---|---|
| 27 | |
| 28 | /** |
| 29 | * Filters the default block className for server rendered blocks. |
| 30 | * |
| 31 | * @since 5.6.0 |
| 32 | * |
| 33 | * @param string $class_name The current applied classname. |
| 34 | * @param string $block_name The block name. |
| 35 | */ |
| 36 | $classname = apply_filters( 'block_default_classname', $classname, $block_name ); |
| 37 | |
| 38 | return $classname; |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Add the generated classnames to the output. |
| 43 | * |
| 44 | * @since 5.6.0 |
| 45 | * |