For new users, the PHP paging generation query function causes an error if no query results exist.

For beginners, what is the paging query function of PHP? if no query result is displayed, an error occurs? PHPcodeinclude (& quot; conn. php & quot;); functionpager ($ rows, $ page_size) {global $ page, $ select_from, $ select_limit, $ pagenav; $ page_countceil ($ rows $ p new paging problem, does the PHP paging generation query function cause an error if no query results exist?

PHP code

  Include ("conn. php "); function pager ($ rows, $ page_size) {global $ page, $ select_from, $ select_limit, $ pagenav; $ page_count = ceil ($ rows/$ page_size ); if ($ page <= 1 | $ page = '') $ page = 1; if ($ page >=$ 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 ";}} //// // calculate the record from $ select_from by using the pager function start retrieval, $ pagenav output paging navigation $ countsql = "select * from manager where 0 = 0 "; if ($ _ POST [chinaname]! = "") {$ Countsql = $ countsql. "and chinaname like '% $ _ POST [chinaname] %'";} if ($ _ POST [Tel]! = "") {$ Countsql = $ countsql. "and Tel like '% $ _ POST [Tel] %'";} $ rows = mysql_num_rows (mysql_query ($ countsql )); $ page = $ _ GET ['Page']; pager ($ rows, 2); $ SQL = "select * from manager where 0 = 0 "; if ($ _ POST [chinaname]! = "") {$ SQL = $ SQL. "and chinaname like '% $ _ POST [chinaname] %'";} if ($ _ POST [Tel]! = "") {$ SQL = $ SQL. "and Tel like '% $ _ POST [Tel] %'";} $ SQL = $ SQL. "limit $ select_from $ select_limit"; echo $ SQL; $ rst = mysql_query ($ SQL); while ($ row = mysql_fetch_array ($ rst )){The problem now is that when I have no results in fuzzy search, the statement displayed in limit is limit -.Should I solve this problem?------ Solution --------------------$ Page_count = ceil ($ rows/$ page_size );If no result is returned, $ rows is 0 and the resulting $ page_count is equal to 0.$ Select_from = (0-1) * 2 $ select_from returns-2.You can add a limit clause to judge that $ page_count is 0.