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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 |
|---|---|
| 2273 | /** |
| 2274 | * Filter the comment form default arguments. |
| 2275 | * |
| 2276 | * Use 'comment_form_default_fields' to filter the comment fields. |
| 2277 | * |
| 2278 | * @since 3.0.0 |
| 2279 | * |
| 2280 | * @param array $defaults The default comment form arguments. |
| 2281 | */ |
| 2282 | $args = wp_parse_args( $args, apply_filters( 'comment_form_defaults', $defaults ) ); |
| 2283 | |
| 2284 | // Ensure that the filtered args contain all required default values. |
| 2285 | $args = array_merge( $defaults, $args ); |
| 2286 | |
| 2287 | if ( comments_open( $post_id ) ) : ?> |
| 2288 | <?php |
| 2289 | /** |
| 2290 | * Fires before the comment form. |
| 2291 | * |