Title: deprecated_hook_trigger_error
Published: August 16, 2016
Last modified: February 24, 2026

---

# apply_filters( ‘deprecated_hook_trigger_error’, bool $trigger )

## In this article

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

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

Filters whether to trigger deprecated hook errors.

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

 `$trigger`bool

Whether to trigger deprecated hook errors. Requires `WP_DEBUG` to be defined true.

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

    ```php
    if ( WP_DEBUG && apply_filters( 'deprecated_hook_trigger_error', true ) ) {
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/functions.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/functions.php#L5970)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/functions.php#L5970-L5970)

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

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

Marks a deprecated action or filter hook as deprecated and throws a notice.

  |

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

| Version | Description | 
| [4.6.0](https://developer.wordpress.org/reference/since/4.6.0/) | Introduced. |

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