How many active developers in Doctrine, Symfony, Zend Framework and CakePHP? [closed]

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I want to know how many active developers are working on the following frameworks: Symfony, Zend Framework and CakePHP and the orm Doctrine. I tried to find this information on repositories but no success...

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Ohloh parses many projects' repositories and extracts contributor information.

For example for CakePHP here.

Of course, that depends on all relevant repos being registered with the Ohloh profile. Also, sometimes, different accounts for the same contributor are not recognized. But it should give you a rough idea in any case.

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ZF2 is on github. 173 forks.

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Look for user groups forums etc on Google and Yahoo and here and judge by the number of entries/threads etc.