Make Predis compatible with HHVM (at least 2.3.0).
Achieving compatibility actually required a few marginal changes:
- HHVM still has some issues with re-entrant calls to __get(). The
applied change is an hack simply because it is ugly, but it is not
wrong and does not break the signature of the options interface.
- Since we cannot rely on the PHP version to detect the availability
of socket_import_stream(), we switched to function_exists(). As an
added bonus, using function_exists() is twice faster.
- In the test suite we removed an assertion for the message of an
E_WARNING simply because HHVM emits a different message. Checking
for the warning is actually enough in that context.
While the whole test suite passes on HHVM 2.3.0, please remember that
HHVM is still in development and things could break anytime especially
in some obscure corner cases.