In order to have these functions available, you must compile PHP with mnoGosearch support by using the --with-mnogosearch option. If you use this option without specifying the path to mnoGosearch, PHP will look for mnoGosearch under /usr/local/mnogosearch path by default. If you installed mnoGosearch at a different location you should specify it: --with-mnogosearch=DIR.
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: » http://pecl.php.net/package/mnogosearch.
Note: PHP contains built-in MySQL access library, which can be used to access MySQL. It is known that mnoGoSearch is not compatible with this built-in library and can work only with generic MySQL libraries. Thus, if you use mnoGoSearch with MySQL, during PHP configuration you have to indicate the directory of your MySQL installation, that was used during mnoGoSearch configuration, i.e. for example: --with-mnogosearch --with-mysql=/usr.