Use require() in wp-settings.php

[scribu]

Currently, require() and require_once() are used seemingly at random throughout wp-settings.php

We should default to require(), for uniformity, and also because it's faster.

The time difference between require_once() and require() is very small, you'd only see a significant difference if there were hundreds of require_once calls.

However, I'd agree that it does seem to be used at random throughout wp-settings. It looks like everything uses require() except the new multisite code & locale stuff.

Replaced 7 instances of require_once() with require() in wp-settings.php.

[13251]

Sorry Scott, forgot the props. Thanks for the patch.