Title: pre_comment_user_agent
Published: April 25, 2014
Last modified: August 20, 2026

---

# apply_filters( ‘pre_comment_user_agent’, string $comment_agent )

## In this article

 * [Parameters](https://developer.wordpress.org/reference/hooks/pre_comment_user_agent/?output_format=md#parameters)
 * [Source](https://developer.wordpress.org/reference/hooks/pre_comment_user_agent/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/hooks/pre_comment_user_agent/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/hooks/pre_comment_user_agent/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/hooks/pre_comment_user_agent/?output_format=md#wp--skip-link--target)

Filters the comment author’s browser user agent before it is set.

## 󠀁[Parameters](https://developer.wordpress.org/reference/hooks/pre_comment_user_agent/?output_format=md#parameters)󠁿

 `$comment_agent`string

The comment author’s browser user agent.

## 󠀁[Source](https://developer.wordpress.org/reference/hooks/pre_comment_user_agent/?output_format=md#source)󠁿

    ```php
    $commentdata['comment_agent'] = apply_filters( 'pre_comment_user_agent', ( $commentdata['comment_agent'] ?? '' ) );
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/comment.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.1/src/wp-includes/comment.php#L2276)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.1/src/wp-includes/comment.php#L2276-L2276)

## 󠀁[Related](https://developer.wordpress.org/reference/hooks/pre_comment_user_agent/?output_format=md#related)󠁿

| Used by | Description | 
| [wp_filter_comment()](https://developer.wordpress.org/reference/functions/wp_filter_comment/)`wp-includes/comment.php` |

Filters and sanitizes comment data.

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/hooks/pre_comment_user_agent/?output_format=md#changelog)󠁿

| Version | Description | 
| [1.5.0](https://developer.wordpress.org/reference/since/1.5.0/) | Introduced. |

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