wpdb::select( string $db, mysqli $dbh = null )

1192	public function select( $db, $dbh = null ) {1193		if ( is_null( $dbh ) ) {1194			$dbh = $this->dbh;1195		}1196 1197		$success = mysqli_select_db( $dbh, $db );1198 1199		if ( ! $success ) {1200			$this->ready = false;1201			if ( ! did_action( 'template_redirect' ) ) {1202				wp_load_translations_early();1203 1204				$message = '<h1>' . __( 'Cannot select database' ) . "</h1>\n";1205 1206				$message .= '<p>' . sprintf(1207					/* translators: %s: Database name. */1208					__( 'The database server could be connected to (which means your username and password is okay) but the %s database could not be selected.' ),1209					'<code>' . htmlspecialchars( $db, ENT_QUOTES ) . '</code>'1210				) . "</p>\n";1211 1212				$message .= "<ul>\n";1213				$message .= '<li>' . __( 'Are you sure it exists?' ) . "</li>\n";1214 1215				$message .= '<li>' . sprintf(1216					/* translators: 1: Database user, 2: Database name. */1217					__( 'Does the user %1$s have permission to use the %2$s database?' ),1218					'<code>' . htmlspecialchars( $this->dbuser, ENT_QUOTES ) . '</code>',1219					'<code>' . htmlspecialchars( $db, ENT_QUOTES ) . '</code>'1220				) . "</li>\n";1221 1222				$message .= '<li>' . sprintf(1223					/* translators: %s: Database name. */1224					__( 'On some systems the name of your database is prefixed with your username, so it would be like <code>username_%1$s</code>. Could that be the problem?' ),1225					htmlspecialchars( $db, ENT_QUOTES )1226				) . "</li>\n";1227 1228				$message .= "</ul>\n";1229 1230				$message .= '<p>' . sprintf(1231					/* translators: %s: Support forums URL. */1232					__( 'If you do not know how to set up a database you should <strong>contact your host</strong>. If all else fails you may find help at the <a href="%s">WordPress support forums</a>.' ),1233					__( 'https://wordpress.org/support/forums/' )1234				) . "</p>\n";1235 1236				$this->bail( $message, 'db_select_fail' );1237			}1238		}1239	}