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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 |
|---|---|
| 2597 | /** |
| 2598 | * Filters the comment form default arguments. |
| 2599 | * |
| 2600 | * Use {@see 'comment_form_default_fields'} to filter the comment fields. |
| 2601 | * |
| 2602 | * @since 3.0.0 |
| 2603 | * |
| 2604 | * @param array $defaults The default comment form arguments. |
| 2605 | */ |
| 2606 | $args = wp_parse_args( $args, apply_filters( 'comment_form_defaults', $defaults ) ); |
| 2607 | |
| 2608 | // Ensure that the filtered arguments contain all required default values. |
| 2609 | $args = array_merge( $defaults, $args ); |
| 2610 | |
| 2611 | // Remove `aria-describedby` from the email field if there's no associated description. |
| 2612 | if ( isset( $args['fields']['email'] ) && false === strpos( $args['comment_notes_before'], 'id="email-notes"' ) ) { |
| 2613 | $args['fields']['email'] = str_replace( |
| 2614 | ' aria-describedby="email-notes"', |
| 2615 | '', |