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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 |
|---|---|
| 2507 | /** |
| 2508 | * Filters the comment form default arguments. |
| 2509 | * |
| 2510 | * Use {@see 'comment_form_default_fields'} to filter the comment fields. |
| 2511 | * |
| 2512 | * @since 3.0.0 |
| 2513 | * |
| 2514 | * @param array $defaults The default comment form arguments. |
| 2515 | */ |
| 2516 | $args = wp_parse_args( $args, apply_filters( 'comment_form_defaults', $defaults ) ); |
| 2517 | |
| 2518 | // Ensure that the filtered arguments contain all required default values. |
| 2519 | $args = array_merge( $defaults, $args ); |
| 2520 | |
| 2521 | // Remove `aria-describedby` from the email field if there's no associated description. |
| 2522 | if ( isset( $args['fields']['email'] ) && false === strpos( $args['comment_notes_before'], 'id="email-notes"' ) ) { |
| 2523 | $args['fields']['email'] = str_replace( |
| 2524 | ' aria-describedby="email-notes"', |
| 2525 | '', |