(PHP 5 >= 5.1.2, PHP 7, PHP 8, PECL xmlwriter >= 1.0.0)
XMLWriter::flush -- xmlwriter_flush — Flush current buffer
Object-oriented style
$empty = true): string|intProcedural style
Flushes the current buffer.
writerOnly for procedural calls. The XMLWriter instance that is being modified. This object is returned from a call to xmlwriter_open_uri() or xmlwriter_open_memory().
empty
       Whether to empty the buffer or not. Default is true.
      
If you opened the writer in memory, this function returns the generated XML buffer, Else, if using URI, this function will write the buffer and return the number of written bytes.
| Version | Description | 
|---|---|
| 8.0.0 | writerexpects an XMLWriter
  instance now; previously, a resource was expected. | 
| 8.0.0 | This function can no longer return false. |