WordPress Version: 4.6
/**
* Sets a cookie for a user who just logged in. This function is deprecated.
*
* @since 1.5.0
* @deprecated 2.5.0 Use wp_set_auth_cookie()
* @see wp_set_auth_cookie()
*
* @param string $username The user's username
* @param string $password Optional. The user's password
* @param bool $already_md5 Optional. Whether the password has already been through MD5
* @param string $home Optional. Will be used instead of COOKIEPATH if set
* @param string $siteurl Optional. Will be used instead of SITECOOKIEPATH if set
* @param bool $remember Optional. Remember that the user is logged in
*/
function wp_setcookie($username, $password = '', $already_md5 = false, $home = '', $siteurl = '', $remember = false)
{
_deprecated_function(__FUNCTION__, '2.5.0', 'wp_set_auth_cookie()');
$user = get_user_by('login', $username);
wp_set_auth_cookie($user->ID, $remember);
}