Runtime Configuration

The behaviour of these functions is affected by
settings in php.ini.

Here’s a short explanation of the configuration
directives.

mysqlnd_ms.enable integer

Enables or disables the plugin. If disabled, the
extension will not plug into mysqlnd to proxy internal mysqlnd C API calls.

mysqlnd_ms.force_config_usage integer

If enabled, the plugin checks if the host (server)
parameters value of any MySQL connection attempt, matches a section
name from the plugin configuration file. If not, the connection
attempt is blocked.

This setting is not only useful to restrict PHP to
certain servers but also to debug configuration file problems. The
configuration file validity is checked at two different stages. The
first check is performed when PHP begins to handle a web request.
At this point the plugin reads and decodes the configuration file.
Errors thrown at this early stage in an extensions life cycle may
not be shown properly to the user. Thus, the plugin buffers the
errors, if any, and additionally displays them when establishing a
connection to MySQL. By default a buffered startup error will emit
an error of type E_WARNING. If force_config_usage
is set, the error type used is E_RECOVERABLE_ERROR.

Please, see also configuration file debugging notes.

mysqlnd_ms.ini_file string

Plugin specific configuration file. This setting
has been renamed to mysqlnd_ms.config_file in version
1.4.0.

mysqlnd_ms.config_file string

Plugin specific configuration file. This setting
superseeds mysqlnd_ms.ini_file since 1.4.0.

mysqlnd_ms.collect_statistics integer

Enables or disables the collection of statistics.
The collection of statistics is disabled by default for performance
reasons. Statistics are returned by the function mysqlnd_ms_get_stats().

mysqlnd_ms.multi_master integer

Enables or disables support of MySQL multi master
replication setups. Please, see also supported
clusters.

mysqlnd_ms.disable_rw_split integer

Enables or disables built-in read write
splitting.

Controls whether load balancing and lazy connection
functionality can be used independently of read write splitting. If
read write splitting is disabled, only servers from the master list
will be used for statement execution. All configured slave servers
will be ignored.

The SQL hint MYSQLND_MS_USE_SLAVE will not
be recognized. If found, the statement will be redirected to a
master.

Disabling read write splitting impacts the return
value of mysqlnd_ms_query_is_select(). The function
will no longer propose query execution on slave servers.

Note: Multiple master
servers

Setting mysqlnd_ms.multi_master=1 allows
the plugin to use multiple master servers, instead of only the
first master server of the master list.

Please, see also supported
clusters.