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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 |
|---|---|
| 3568 | |
| 3569 | /** |
| 3570 | * Filters whether an empty comment should be allowed. |
| 3571 | * |
| 3572 | * @since 5.1.0 |
| 3573 | * |
| 3574 | * @param bool $allow_empty_comment Whether to allow empty comments. Default false. |
| 3575 | * @param array $commentdata Array of comment data to be sent to wp_insert_comment(). |
| 3576 | */ |
| 3577 | $allow_empty_comment = apply_filters( 'allow_empty_comment', false, $commentdata ); |
| 3578 | if ( '' === $comment_content && ! $allow_empty_comment ) { |
| 3579 | return new WP_Error( 'require_valid_comment', __( '<strong>Error</strong>: Please type your comment text.' ), 200 ); |
| 3580 | } |
| 3581 | |
| 3582 | $check_max_lengths = wp_check_comment_data_max_lengths( $commentdata ); |
| 3583 | if ( is_wp_error( $check_max_lengths ) ) { |
| 3584 | return $check_max_lengths; |
| 3585 | } |
| 3586 | |