mysqli_change_user mysqli->change_user Changes the user of the specified database connection Procedural style: boolmysqli_change_user objectlink stringuser stringpassword stringdatabase Object oriented style (method): mysqli bool change_user stringuser stringpassword stringdatabase mysqli_change_user is used to change the user of the specified database connection as given by the link parameter and to set the current database to that specified by the database parameter. If desired, the &null; value may be passed in place of the database parameter resulting in only changing the user and not selecting a database. To select a database in this case use the mysqli_select_db function. In order to successfully change users a valid username and password parameters must be provided and that user must have sufficient permissions to access the desired database. If for any reason authorization fails, the current user authentication will remain. Using this command will always cause the current database connection to behave as if was a completely new database connection, regardless of if the operation was completed successfully. This reset includes performing a rollback on any active transactions, closing all temporary tables, and unlocking all locked tables. &return.success; mysqli_connect mysqli_select_db query("SET @a:=1"); /* reset all and select a new database */ $mysqli->change_user("my_user", "my_password", "world"); if ($result = $mysqli->query("SELECT DATABASE()")) { $row = $result->fetch_row(); printf("Default database: %s\n", $row[0]); $result->close(); } if ($result = $mysqli->query("SELECT @a")) { $row = $result->fetch_row(); if ($row[0] === NULL) { printf("Value of variable a is NULL\n"); } $result->close(); } /* close connection */ $mysqli->close(); ?> ]]> ]]> The above examples would produce the following output: