RewriteEngine on

#RewriteBase /this_application_directory

RewriteRule ^shop/([a-z]+)/(.*)/([a-zA-Z0-9]+).php page_detail.php?table_name=$1&sku=$3 [L]
RewriteRule ^shop/([a-z]+)/([a-zA-Z0-9]+).php page_detail.php?table_name=$1&sku=$2 [L]

RewriteRule ^shop/([a-z]+)/(.*)/page-([0-9]+) page_category.php?table_name=$1&category=$2&page=$3 [L]
RewriteRule ^shop/([a-z]+)/page-([0-9]+) page_category.php?table_name=$1&category=&page=$2 [L]

RewriteRule ^shop/([a-z]+)/(.*) page_category.php?table_name=$1&category=$2 [L]