apply_filters( 'template_directory', string $template_dir, string $template, string $theme_root )
Filters the current theme directory path.
Parameters
- $template_dir
-  (string) The path of the current theme directory. 
- $template
-  (string) Directory name of the current theme. 
- $theme_root
-  (string) Absolute path to the themes directory. 
Source
File: wp-includes/theme.php
Changelog
| Version | Description | 
|---|---|
| 1.5.0 | Introduced. | 
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Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/hooks/template_directory