How to fix MySQLI real_connect HY000 2002 in Codeigniter 3 and core PHP connection

How to fix MySQLI real_connect HY000 2002 in Codeigniter 3 and core PHP connection How to fix mysqli::real_connect(): (HY000/2002): No connection could be made because the target machine actively refused it.A PHP Error was encounteredSeverity: WarningMessage: mysqli::real_connect(): (HY000/2002): No connection could be made because the target machine actively refused it.Filename: mysqli/mysqli_driver.phpLine Number: 211Backtrace:File: C:xampphtdocsshopdeshapplicationcontrollersAdminlog.phpLine: 6Function: __constructFile: C:xampphtdocsshopdeshindex.phpLine: 315 Function: require_onceSolution 1st step First in in codeigniter you can write port no with localhost try first &= & or other 2nd try &= & path application / config / database.php &= & &= & &= & 2nd) step add database libraries in autoload.php path application / config / autoload.php $autoload[&= array(& main libraries for mysql connection is &other libraries used for validation , session and other taskif you are use core php &= &&= 'root',