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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 |
|---|---|
| 2244 | /** |
| 2245 | * Filter the comment form default arguments. |
| 2246 | * |
| 2247 | * Use 'comment_form_default_fields' to filter the comment fields. |
| 2248 | * |
| 2249 | * @since 3.0.0 |
| 2250 | * |
| 2251 | * @param array $defaults The default comment form arguments. |
| 2252 | */ |
| 2253 | $args = wp_parse_args( $args, apply_filters( 'comment_form_defaults', $defaults ) ); |
| 2254 | |
| 2255 | if ( comments_open( $post_id ) ) : ?> |
| 2256 | <?php |
| 2257 | /** |
| 2258 | * Fires before the comment form. |
| 2259 | * |
| 2260 | * @since 3.0.0 |
| 2261 | */ |
| 2262 | do_action( 'comment_form_before' ); |