WordPress at a glance
function is not described

_preview_theme_template_filter() WP 2.9.0

Deprecated in 4.3.0. It is no longer supported and can be removed in future releases. It is recommended to replace this function with the same one.

Private function to modify the current template when previewing a theme

No Hooks.

Return

String.

Usage

_preview_theme_template_filter();

Code of preview theme template filter: wp-includes/deprecated.php VER 5.0.3

<?php
function _preview_theme_template_filter() {
	_deprecated_function( __FUNCTION__, '4.3.0' );
	return '';
}