The `XMLWriter.flush` function is a method in PHP's XMLWriter class that flushes all remaining data from the XMLWriter buffer to the output.
By calling this function, any pending data that has not been outputted using the `XMLWriter.write` method will be written out to the specified output target. This can be useful when generating XML documents on the fly and need to ensure that all the data is written to the output before further processing.
It is important to note that once the `flush` method is called, the XMLWriter object is still usable and new data can be written to it.
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