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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 |
|---|---|
| 2502 | esc_attr( $args['class_form'] ), |
| 2503 | ( $html5 ? ' novalidate' : '' ) |
| 2504 | ); |
| 2505 | |
| 2506 | /** |
| 2507 | * Fires at the top of the comment form, inside the form tag. |
| 2508 | * |
| 2509 | * @since 3.0.0 |
| 2510 | */ |
| 2511 | do_action( 'comment_form_top' ); |
| 2512 | |
| 2513 | if ( is_user_logged_in() ) : |
| 2514 | |
| 2515 | /** |
| 2516 | * Filters the 'logged in' message for the comment form for display. |
| 2517 | * |
| 2518 | * @since 3.0.0 |
| 2519 | * |
| 2520 | * @param string $args_logged_in The logged-in-as HTML-formatted message. |