EllisLab/CodeIgniter — pull request #946 by twobee (2012-01-20 09:46:02+00:00)
Title: Replaced time() with $_SERVER['REQUEST_TIME']

Ok, once again. :(

> Restoring $_SERVER['REQUEST_TIME'] as a long and introducing
> $_SERVER['REQUEST_TIME_FLOAT'] to include microsecond precision. (Patrick)

https://svn.php.net/repository/php/php-src/tags/php_5_4_0RC6/NEWS