I don't know much about the upload parameters.

Let's take a look at the parameter passing problem. I don't quite understand $ action =$ _ REQUEST ['AC']? $ _ REQUEST ['AC']: 'list'; why do you want to write this? what does it mean? I don't understand & nbsp; if ($ action = 'list ') {/* Check the parameter passing problem on the page. I don't quite understand it.
$ Action = $ _ REQUEST ['AC']? $ _ REQUEST ['AC']: 'list'; why do you want to write this? what do you mean?
If ($ action = 'list ')
{
/* Paging */
$ Tpp = 15;
$ Page = max (1, intval ($ _ REQUEST ['Page']);
$ Start_limit = ($ page-1) * $ tpp;
$ Url = "? Act = list ";
$ Cat_id = isset ($ _ REQUEST ['cat _ id'])? Intval ($ _ REQUEST ['cat _ id']): 0; why is this write? there are more than 0

Switch ($ sortkey)
{
Case 'id ':
$ Order = "order by id DESC ";
$ Url. = "& orderby = $ orderby"; why? =
Break;
Case 'visit ':
$ Order = "order by views DESC ";
$ Url. = "& ord





------ Solution --------------------
$ Url. = "& orderby = $ orderby"; why? =
Assemble url connections.

Let me add an example.

$ Url = '20140901 ';
$ Url. = '20140901 ';

Echo $ url;
// Output: 123456789