Straightforward Steps to get PHP Yaz to work on win32:Download latest verion of php_yaz.dll and copy to your PHP extensions directoryhttp://ftp.indexdata.dk/pub/phpyaz/Download latest version of YAZ toolkit and install ithttp://www.indexdata.dk/yaz/Go to the YAZ toolkit directory(Most likely C:\Program Files\YAZ\bin)Copy the 4 DLL files in that folder into your win32 directoryUncomment the "extention=php_yaz.dll;" line in php.iniRestart your web server.Uninstall the YAZ toolkit if you wish.When using Apache, you must also place libxslt.dll and yaz5.dll in \xampp\apache\bin . (No need need to copy libxml2 because it is already there).For those wondering what it is:"This standard defines a client/server based service and protocol forInformation Retrieval. It specifies procedures and formats for a client to search adatabase provided by a server, retrieve database records, and perform relatedinformation retrieval functions. The protocol addresses communication betweeninformation retrieval applications at the client and server; it does not address interactionbetween the client and the end-user."Updated steps to install this extension on windows 7 (january 2018)1)Go to: http://ftp.indexdata.dk/pub/phpyaz/windows/ and search trough the folders until you find the one that matches your php installation.2)Download all four files: libxml2.dll, libxslt.dll, php_yaz.dll, yaz5.dll3)Place the following files inside your php folder (\xampp\php): libxml2.dll, libxslt.dll, yaz5.dll4)Place php_yaz.dll inside your php extensions folder (xampp\php\ext)5)Add the following line to php.ini (you can find out where is php.ini located calling phpinfo): extension=php_yaz.dll(look for the place where all the other extension are declarated and place it at the bottom as the las one installed)6)Restart your serverThat should work. You can check if it is installed by calling phpinfo and checking if yaz extension appears as a section.Cheers!