Manage PHP version during pecl install

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Hi,

With upcoming PHP 7 some extension maintainers have choose to maintain
2 different version, one for PHP 5, another for PHP 7

Ex:
	rrd 1.x for PHP 5, 2.x for PHP 7
	pthreads 2.x for PHP 5, 3.x for PHP 7

(some other use the same version for both, simpler for user)

Digging a little in the PEAR code, I think it will be nice to check
extension PHP minimal version against current PHP version.

But, IIUC, this will require to extend the REST schema (1.4 ?) to
include this information.

I think "min" is enough to avoid pecl with PHP 5 to try to pull an
incompatible version. ("max" could be useful, but most old extensions
don't have this information, and sometime we have max=5.99.99,
sometime max=7.0.0, exclude=7.0.0)


Does this sound sensible and doable ?
Any thoughts ?


Remi;
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