Information for installing this PECL extension may be found in the manual chapter titled Installation of PECL extensions. Additional information such as new releases, downloads, source files, maintainer information, and a CHANGELOG, can be located here: ยป http://pecl.php.net/package/mysqlnd-uh
PECL/mysqlnd_uh is currently not available on Windows. The source code of the extension makes use of C99 constructs not allowed with PHP Windows builds.