Control Excerpt Length using Filters

By default, excerpt length is set to 55 words. To change excerpt length using excerpt_length filter, add the following code to functions.php file in your theme:

function new_excerpt_length($length) {
 return 20;
}
add_filter('excerpt_length', 'new_excerpt_length');

How to take backup(project & database) from XAMPP?

We can take database backup from 

C:\xampp\mysql\data Directory

and code from 

c:\xampp\htdocs

then reinstall xampp.