Musíte zadat název hostitele instance MySQL, nikoli adresu URL pro phpMyAdmin.
Změnit
... mysqli("http://localhost/us_phpmyadmin/","","","url_short");
do
... mysqli("localhost", "", "", "url_short");
^^^^^^^^^
Musíte zadat název hostitele instance MySQL, nikoli adresu URL pro phpMyAdmin.
Změnit
... mysqli("http://localhost/us_phpmyadmin/","","","url_short");
do
... mysqli("localhost", "", "", "url_short");
^^^^^^^^^