Why has PHP Module Penetration on Apache been falling for the past 5 years?

According to Security Space The penetration of PHP on Apache servers has 开发者_开发技巧been falling since the start of 2005, my question is why? PHP seems to be doing very well, are people using Ruby or other languages.....

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More professional hosters are migrating to PHP on FastCGI and suexec. And this isn't counted into that graph (which presumably is about mod_php penetration, not PHP). It also wouldn't count Quercus or Project Zeros PHP runtime, nor HipHop.

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Did you scroll all the way to the bottom?

Readers are cautioned that the Growth percentages are based on a module's market share penetration rather than the absolute number of modules we detected. Thus, it is possible for the number of modules to increase, while the growth is actually a negative value.

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Another possible answer, besides the normal caveats in this statistical data, is that with more maturity of suexec using fastcgi+suexec is terribly more secure & desirable on a multi-user hosting platform then php as a module, for which the safe_mode possibilities were a incomplete attempt to readd some security.