[_ck_]

Sam, I can already tell you that from my 5000 site survey.

This data is from mid-October 2008

PHP Popularity

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4.2 : 1

4.3 : 249

4.4 : 1088

5.0 : 41

5.1 : 261

5.2 : 2464

unknown : 700+

or in finer detail:

4.2.2 => 1

4.3.0 => 1

4.3.2 => 4

4.3.3 => 3

4.3.4 => 7

4.3.8 => 6

4.3.9 => 115

4.3.10 => 51

4.3.11 => 62

4.4.0 => 12

4.4.1 => 23

4.4.2 => 29

4.4.3 => 13

4.4.4 => 85

4.4.5 => 4

4.4.6 => 32

4.4.7 => 191

4.4.8 => 414

4.4.9 => 285

5.0.3 => 1

5.0.4 => 32

5.0.5 => 8

5.1.1 => 3

5.1.2 => 39

5.1.3 => 1

5.1.4 => 17

5.1.5 => 4

5.1.6 => 197

5.2.0 => 183

5.2.1 => 79

5.2.2 => 51

5.2.3 => 121

5.2.4 => 171

5.2.5 => 537

5.2.6 => 1318

5.2.8 => 4

unknown : 700+

I will be updating the survey next month and I expect the sites to double.

(If you really need me to, I guess I can rush the survey update earlier)