It's not really apples and oranges - writing a website in raw Ruby is not a very feasible or popular option, whereas writing a website in raw PHP is. It is valid to compare writing a site in PHP and writing a website in Rails. It is also valid to compare writing one in Cake vs. RoR, as well as Cake vs. raw PHP (or a custom PHP framework, which is what raw PHP inevitably becomes in a sufficiently large project).
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