wp-includes/deprecated.php:1449Display the nickname of the author of the current post.
function the_author_nickname() { _deprecated_function( __FUNCTION__, '2.8.0', 'the_author_meta(\'nickname\')' ); the_author_meta('nickname');}Introduced in 0.71. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.