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int xml_parse ( resource $parser , string $data [, bool $is_final= false ] )

xml_parse() parses an XML document. The handlers for the configured events are called as many times as necessary.

parser: A reference to the XML parser to use.
data: Chunk of data to parse. A document may be parsed piece-wise by calling xml_parse() several times with new data, as long as the is_final parameter is set and TRUE when the last data is parsed.
is_final: If set and TRUE, data is the last piece of data sent in this parse.

Returns 1 on success or 0 on failure.

Замечание: Entity errors are reported at the end of the data thus only if is_final is set and TRUE.