wp-includes/category.php:207Retrieves the ID of a category from its name.
$cat_namestringintfunction get_cat_ID( $cat_name ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid $cat = get_term_by( 'name', $cat_name, 'category' ); if ( $cat ) { return $cat->term_id; } return 0;}Introduced in 1.0.0. 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.