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

---

# _preview_theme_template_filter(): string

## In this article

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

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

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.

Private function to modify the current template when previewing a theme

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

 string

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

    ```php
    function _preview_theme_template_filter() {
    	_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#L3522)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.1/src/wp-includes/deprecated.php#L3522-L3525)

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

| Version | Description | 
| [4.3.0](https://developer.wordpress.org/reference/since/4.3.0/) | Deprecated.  | 
| [2.9.0](https://developer.wordpress.org/reference/since/2.9.0/) | Introduced. |

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