In this article we will discuss the housekeeping steps you must perform before you make any modifications to a theme — creating a copy of the theme being modified and making the files “writable” so that you can use the WordPress Theme Editor. For a general review of how your blog is generated by PHP, please read Part 1 of this Series.
IMPORTANT: For the purpose of this series of tutorials, I’ll be using the WP 2.5.1 DEFAULT template for all examples.
Creating a Copy of the Theme
You should never make major modifications to a theme without making a new working copy of that theme! [I define major as anything other than things like font color or other minor modifications to general styling.]
The reason I say this is primarily because you need a backup copy of the theme you can refer back to if something goes wrong during the modification process. The other reason is also related to potential problems — you need a fallback, the ability to put things back the way they were with a single click “just in case”.
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