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  1. Hi all, I have collected here the most critical new mySqli usage and issues for addon edits recommendation. 1. Different return values from tep_db_query() mysql return false or result mysqli return result object or false Would be better to control the result before do anything: if (tep_db_num_rows("query string") > 0) { //than do something } Try avoid examination on result directly: $result = tep_db_query("query string"); if ($result = 'something') 2. some construction problem may close the mysql connection so a similar error messages found: possible issues - non oscommerce standard redirection Note: when PHP script is finished the database connection automatic closed. 3. hard coded mysql database PHP usage After the updates hardly recommended to use mysqli core built in functions. PHP 5.4 store deprecated errors. mysql_query PHP functions will not be supported in PHP 5.5 version. Other tips are welcome! Best Regards, Gergely