 .htaccess 

RewriteRule ^inventory/([0-9]*)/sklad/?$ modules/inventory/item.php?item_id=$1&sklad [L,QSA]
RewriteRule ^inventory/([0-9]*)/sklad/yes/?$ modules/inventory/item.php?item_id=$1&sklad&yes [L,QSA]
RewriteRule ^sklad/?$ modules/shop/sklad.php [L,QSA]
RewriteRule ^sklad/item/([0-9]*)/buy/?$ /modules/shop/sklad_item.php?item_id=$1&buy [L,QSA]
RewriteRule ^sklad/item/([0-9]*)/buy/yes?$ /modules/shop/sklad_item.php?item_id=$1&buy&yes [L,QSA]
RewriteRule ^sklad/item/([0-9]*)/?$ /modules/shop/sklad_item.php?item_id=$1 [L,QSA]

  sklad.SQL

  PDO

         /modules/inventory/item.php ( )

    /modules/shop/   sklad.php  sklad_item.php

    http://_/sklad

 :-)