Sets the character data 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:
handler ( int parser, string data)
The first parameter, parser, is a reference to the XML parser calling the handler.
The second parameter, data, contains the character data as a string.
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.
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