Orthogonailty with PHP development

I am reading the "Pragmatic Programmer", I am at the section were they talk about "Orthogonailty" and the approach to take when coding. I was wondering if you can implement the "Orthogonailty" technique with PHP application development because in the book its mainly about software development?

Do you know of any articles which talk about PHP and "Orthogonailty" or does any one have a view on this matter?

Solution

"Orthogonality" is a term copied from linear algebra: saying "x and y are orthogonal" means "x is perpendicular to y".

In the case of software development, two orthogonal parts of a system may be varied independently without impacting the other. In particular, the implication is that parts of a system are orthogonal when, as you make changes in one part, side effects of your changes don't affect other parts.

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