Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo for db failed: No such host is known. in D:\WEB_DEV\E-commerce-main\utility\connection.php on line 3

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for db failed: No such host is known. in D:\WEB_DEV\E-commerce-main\utility\connection.php:3 Stack trace: #0 D:\WEB_DEV\E-commerce-main\utility\connection.php(3): mysqli_connect('db', 'root', Object(SensitiveParameterValue)) #1 D:\WEB_DEV\E-commerce-main\utility\utility.php(2): require('D:\\WEB_DEV\\E-co...') #2 D:\WEB_DEV\E-commerce-main\require\top.php(2): require('D:\\WEB_DEV\\E-co...') #3 D:\WEB_DEV\E-commerce-main\index.php(1): require('D:\\WEB_DEV\\E-co...') #4 {main} thrown in D:\WEB_DEV\E-commerce-main\utility\connection.php on line 3