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: handler
( resource 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. 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.
注: 除了函數名稱, 也提供一個包含物件參考的陣列和一個方法名稱。