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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 |
|---|---|
| 3371 | |
| 3372 | /** |
| 3373 | * Filters whether an empty comment should be allowed. |
| 3374 | * |
| 3375 | * @since 5.1.0 |
| 3376 | * |
| 3377 | * @param bool $allow_empty_comment Whether to allow empty comments. Default false. |
| 3378 | * @param array $commentdata Array of comment data to be sent to wp_insert_comment(). |
| 3379 | */ |
| 3380 | $allow_empty_comment = apply_filters( 'allow_empty_comment', false, $commentdata ); |
| 3381 | if ( '' === $comment_content && ! $allow_empty_comment ) { |
| 3382 | return new WP_Error( 'require_valid_comment', __( '<strong>Error</strong>: Please type a comment.' ), 200 ); |
| 3383 | } |
| 3384 | |
| 3385 | $check_max_lengths = wp_check_comment_data_max_lengths( $commentdata ); |
| 3386 | if ( is_wp_error( $check_max_lengths ) ) { |
| 3387 | return $check_max_lengths; |
| 3388 | } |
| 3389 | |