Fix compilation on PHP 5.4.
Fix compilation on PHP 5.4.

RustJason/phpiredis,RustJason/phpiredis,Danack/phpiredis,nrk/phpiredis,Danack/phpiredis,jymsy/phpiredis,jymsy/phpiredis,nrk/phpiredis,RustJason/phpiredis,Danack/phpiredis,nrk/phpiredis