On the Ibuildings blog there's a new post that looks to answer the question "is PHP an agile programming language?"

In raising the question about whether a specific programming language is agile I want to avoid exploring what makes a language agile, or comparing PHP with other languages. The intention here is not to associate PHP to agile as a natural relationship, as much as to try and understand if we can find the ingredients in the PHP world, for creating an agile environment.

He (Marcello Duarte) first defines agile development practices for those not familiar and talks about the tools that PHP has to offer that fit in with that goal. He notes that PHP fits in well with the goals of agile development in being both light and powerful.