To disable access from your network, Open httpd-xampp.conf
located in xampp-folder\apache\conf\extra\httpd-xampp.conf
Change this:
<LocationMatch "^/(?i:(?:xampp|security|licenses|phpmyadmin|webalizer|server-status|server-info))">
Order deny,allow
Deny from all
Allow from ::1 127.0.0.0/8 \
fc00::/7 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 \
fe80::/10 169.254.0.0/16
ErrorDocument 403 /error/XAMPP_FORBIDDEN.html.var
</LocationMatch>
To this:
<LocationMatch "^/(?i:(?:xampp|security|licenses|phpmyadmin|webalizer|server-status|server-info))">
Order deny,allow
Deny from all
Allow from ::1 127.0.0.0/8 \
fc00::/7 10.0.0.0/8 172.16.0.0/12 \
fe80::/10 169.254.0.0/16
ErrorDocument 403 /error/XAMPP_FORBIDDEN.html.var
</LocationMatch>
Don't forget to restart Apache. Now http://localhost/phpmyadmin
will result 403 Forbidden error.
For more info read you can read http://www.hellothupten.com/2013/11/24/block-access-to-phpmyadmin-from-lan-network-on-xampp/