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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 |
|---|---|
| 3519 | |
| 3520 | /** |
| 3521 | * Filters whether an empty comment should be allowed. |
| 3522 | * |
| 3523 | * @since 5.1.0 |
| 3524 | * |
| 3525 | * @param bool $allow_empty_comment Whether to allow empty comments. Default false. |
| 3526 | * @param array $commentdata Array of comment data to be sent to wp_insert_comment(). |
| 3527 | */ |
| 3528 | $allow_empty_comment = apply_filters( 'allow_empty_comment', false, $commentdata ); |
| 3529 | if ( '' === $comment_content && ! $allow_empty_comment ) { |
| 3530 | return new WP_Error( 'require_valid_comment', __( '<strong>Error</strong>: Please type your comment text.' ), 200 ); |
| 3531 | } |
| 3532 | |
| 3533 | $check_max_lengths = wp_check_comment_data_max_lengths( $commentdata ); |
| 3534 | if ( is_wp_error( $check_max_lengths ) ) { |
| 3535 | return $check_max_lengths; |
| 3536 | } |
| 3537 | |