wp-includes/category.php:189Retrieves a category object by category slug.
$slugstringobject|falsefunction get_category_by_slug( $slug ) { $category = get_term_by( 'slug', $slug, 'category' ); if ( $category ) { _make_cat_compat( $category ); } return $category;}Introduced in 2.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/category.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.