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

---

# preview_theme_ob_filter_callback( array $matches ): string

## In this article

 * [Description](https://developer.wordpress.org/reference/functions/preview_theme_ob_filter_callback/?output_format=md#description)
 * [Parameters](https://developer.wordpress.org/reference/functions/preview_theme_ob_filter_callback/?output_format=md#parameters)
 * [Return](https://developer.wordpress.org/reference/functions/preview_theme_ob_filter_callback/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/functions/preview_theme_ob_filter_callback/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/functions/preview_theme_ob_filter_callback/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/functions/preview_theme_ob_filter_callback/?output_format=md#changelog)

This function has been deprecated since 4.3.0.

This function’s access is marked private. This means it is not intended for use 
by plugin or theme developers, only by core. It is listed here for completeness.

Manipulates preview theme links in order to control and maintain location.

## 󠀁[Description](https://developer.wordpress.org/reference/functions/preview_theme_ob_filter_callback/?output_format=md#description)󠁿

Callback function for preg_replace_callback() to accept and filter matches.

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

 `$matches`arrayrequired

## 󠀁[Return](https://developer.wordpress.org/reference/functions/preview_theme_ob_filter_callback/?output_format=md#return)󠁿

 string

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

    ```php
    function preview_theme_ob_filter_callback( $matches ) {
    	_deprecated_function( __FUNCTION__, '4.3.0' );
    	return '';
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/deprecated.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.1/src/wp-includes/deprecated.php#L3568)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.1/src/wp-includes/deprecated.php#L3568-L3571)

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

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

Marks a function as deprecated and inform when it has been used.

  |

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

| Version | Description | 
| [4.3.0](https://developer.wordpress.org/reference/since/4.3.0/) | Deprecated.  | 
| [2.6.0](https://developer.wordpress.org/reference/since/2.6.0/) | Introduced. |

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