(const char *name, const char *version="1.0", int apiVersion=ZAPI_API_VERSION)
The first two parameters should be filled by the extension programmer with the
name of the extension, and the version number of the extension (like “1.0”).
The third parameter, apiversion, does not have to be supplied and is best kept
to the default value. This third parameter checks whether the PHP-CPP version
that is currently installed on the server is the same as the PHP-CPP version
that was used to compile the extension with.
Extension version string
ZAPI API version (this should always be ZAPI_API_VERSION, so you better not supply it)