[PHP-DEV] Add deg2grad() and grad2deg() in PHP5.3

[Kalle Sommer Nielsen]

Greetings internals

I've made two functions that allows convertion between degress and gradians, 
below is a pastebin
of the functions as that would look in math.c:
http://www.phpfi.com/318450
If no objections against it I will commit them in PHP_5_3 and HEAD and I 
will prepare some test
cases for those aswell.


Cheers
Kalle 


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