Sets the default handler function for the XML parser parser. handler is a string containing the name of a function that must exist when xml_parse() is called for parser.
The function named by handler must accept two parameters:
The first parameter, parser, is a reference to the XML parser calling the handler.
The second parameter, data, contains the character data. This may be the XML declaration, document type declaration, entities or other data for which no other handler exists.
If a handler function is set to an empty string, or false, the handler in question is disabled.
True is returned if the handler is set up, false if parser is not a parser.
There is currently no support for object/method handlers. See xml_set_object() for using the XML parser within an object.
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