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Function Reference/get stylesheet directory

Retrieve stylesheet directory Path for the current theme/child theme.

Note: Does not contain a trailing slash.

Returns an absolute server path (eg: /home/user/public_html/wp-content/themes/my_theme), not a URI.

To retrieve the URI of the stylesheet directory use get_stylesheet_directory_uri() instead.

<?php get_stylesheet_directory() ?>

None.

Include a PHP file

<?php include( get_stylesheet_directory() . '/includes/myfile.php'); ?>

Uses: apply_filters() Calls 'stylesheet_directory' filter on stylesheet path and name.
Uses: get_stylesheet()
Uses: get_theme_root()
In the event a child theme is being used, that is the directory that will be returned, not the parent theme directory (use get_template_directory() instead if you want the parent directory)

get_stylesheet_directory() is located in wp-includes/theme.php.