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Change current storage handler


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mysqlnd_qc_change_handlerChange current storage handler


bool mysqlnd_qc_change_handler ( mixed $handler )

Sets the storage handler used by the query cache. A list of available storage handler can be obtained from mysqlnd_qc_get_handler(). Which storage are available depends on the compile time configuration of the query cache plugin. The default storage handler is always available. All other storage handler must be enabled explicitly when building the extension.



Handler can be of type string representing the name of a built-in storage handler or an object of type mysqlnd_qc_handler_default. The names of the built-in storage handler are default, APC, MEMCACHE, sqlite.

Return Values

Returns TRUE on success or FALSE on failure.

If changing the storage handler fails a catchable fatal error will be thrown. The query cache cannot operate if the previous storage handler has been shutdown but no new storage handler has been installed.


The example shows the output from the built-in default storage handler. Other storage handler may report different data.


if (
true === mysqlnd_qc_change_handler("default"))
printf("Default storage handler activated");

/* Catchable fatal error */

The above examples will output:

Default storage handler activated
Catchable fatal error: mysqlnd_qc_change_handler(): Unknown handler 'unknown' in (file) on line (line)

See Also

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