EllisLab/CodeIgniter — pull request #2872 by darwinel (2014-02-11 17:30:44+00:00)
Title: Writing style fix based on style guide

„Use of || is discouraged as its clarity on some output devices is low
(looking like the number 11 for instance). && is preferred over AND but
either are acceptable, and a space should always precede and follow !.”