PHP 5 includes the XSL extension by default and can be enabled by adding the argument --with-xsl[=DIR] to your configure line. DIR is the libxslt installation directory.
Michael (2009-06-11 02:26:50)
On some linux systems you might be able to simply do this:
sudo apt-get install php5-xsl
or similar.
bit (2009-06-06 07:00:23)
If you want to activate this extension on Windows, uncomment ";extension=php_xsl.dll" in your php.ini file, and direct it to its respective folder. e.g. "extension=ext/php_xsl.dll"