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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 |
|---|---|
| 2396 | |
| 2397 | /** |
| 2398 | * Filter the submit button for the comment form to display. |
| 2399 | * |
| 2400 | * @since 4.2.0 |
| 2401 | * |
| 2402 | * @param string $submit_button HTML markup for the submit button. |
| 2403 | * @param array $args Arguments passed to `comment_form()`. |
| 2404 | */ |
| 2405 | $submit_button = apply_filters( 'comment_form_submit_button', $submit_button, $args ); |
| 2406 | |
| 2407 | $submit_field = sprintf( |
| 2408 | $args['submit_field'], |
| 2409 | $submit_button, |
| 2410 | get_comment_id_fields( $post_id ) |
| 2411 | ); |
| 2412 | |
| 2413 | /** |
| 2414 | * Filter the submit field for the comment form to display. |