XAMPP 5.6.21: missing PHP Extension xsl

Trabla: XAMPP  5.6.21: missing PHP Extension xsl

Environment:
OS - Win x64
XAMPP - 5.6.21 with PHP 5.6.21 :)

Solving:

1. Stop Apache in XAMPP control panel

2. Open php.ini

1) click "Config" button
2) click "PHP(php.ini)"

3.  Find string  ;extension=php_xsl.dll
and uncomment it - remove ;
and save file and close it.

4.  Start Apache

Hooray!!!