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Sets the current set of "keys" expected in each data array passed to addData. It also sets the way we are adding data to the data table.

void setKeys ([string $method[, array $keys[, bool $reverse]]])

Expected type: Enumerated String
Description: The method in which data is added

Possible string values
Allowed values	Description
'cols'	Each key represents a new column
'rows'	Each key represents a new row (default)

Expected type: Array
Description: An array containing the data

Expected type: Boolean
Description: If true, the values of the $keys array will be used for the keys... (default is false)

Method specifies whether the data passed to addData represents a new column, or a new row.
Keys is an array whose keys are the keys for data being passed to addData().
If reverse is set to true, then the values of the $keys array are used for the keys instead.