mysqli_select_db mysqli->select_db Selects the default database for database queries Description boolmysqli_select_db objectlink stringdbname The mysqli_select_db function selects the default database (specified by the dbname parameter) to be used when performing queries against the database connection represented by the link parameter. This function should only be used to change the default database for the connection. You can select the default database with 4th parameter in mysqli_connect. Return values &return.success; See also mysqli_connect mysqli_real_connect Example Object oriented style query("SELECT DATABASE()")) { $row = $result->fetch_row(); printf("Default database is %s.\n", $row[0]); $result->close(); } /* change db to world db */ $mysqli->select_db("world"); /* return name of current default database */ if ($result = $mysqli->query("SELECT DATABASE()")) { $row = $result->fetch_row(); printf("Default database is %s.\n", $row[0]); $result->close(); } $mysqli->close(); ?> ]]> Procedural style ]]> The above examples would produce the following output: