Codex tools: Log in
This function can be replaced via plugins. If plugins do not redefine these functions, then this will be used instead.
Gets the user cookie login.
This function is deprecated and should no longer be extended as it won't be used anywhere in WordPress. Also, plugins shouldn't use it either.
<?php wp_get_cookie_login() ?>
wp_get_cookie_login() is located in wp-includes/pluggable.php.