wp-includes/load.php:1322Clones an object.
$input_objectobjectobjectfunction wp_clone( $input_object ) { // Use parens for clone to accommodate PHP 4. See #17880. return clone( $input_object );}Introduced in 2.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/load.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.