Beginner's simple PHP paging problems, but I don't know why not paging

Beginner's simple PHP paging problem, but I don't know why not paging? PHPcode & lt ;? Functionpager ($ rows, $ page_size) {global $ page, $ select_from, $ select_limit, $ pagenav; $ page_count = ceil (simple PHP paging problem for beginners in $ ro, but I don't know why not paging?

PHP code

  
  = $ Page_count) $ page = $ page_count; $ select_limit = $ page_size; $ select_from = ($ page-1) * $ page_size. ','; $ pre_page = ($ page = 1 )? 1: $ page-1; $ next_page = ($ page = $ page_count )? $ Page_count: $ page + 1; $ pagenav. = "$ page/$ page_count page $ rows records"; $ pagenav. = "homepage"; $ pagenav. = "previous page"; $ pagenav. = "next page"; $ pagenav. = "Last page"; $ pagenav. = "Jump\ N "; for ($ I = 1; $ I <= $ page_count; $ I ++) {if ($ I = $ page) $ pagenav. ="$ I\ N "; else $ pagenav. ="$ I\ N ";}}include (" conn. php "); //// // calculate the record from $ select_from by using the pager function start retrieval, $ pagenav output paging navigation $ rows = mysql_num_rows (mysql_query ("select * from manager ")); echo $ rows; pager ($ rows, 2); $ SQL = "select * from manager limit $ select_from $ select_limit"; echo $ SQL; $ rst = mysql_query ($ SQL ); while ($ row = mysql_fetch_array ($ rst) {?>                    
            
            
            
            
            
            
            
            
            
            
  

The specific page number is calculated, that is, clicking the next page cannot be used to flip the page, which is very depressing.

------ Solution --------------------
Where is the variable $ page used in the pager function assigned a value?