mysqli_select_db mysqli->select_db Selects the default database for database queries 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.success; mysqli_connect mysqli_real_connect