(PHP 4, PHP 5, PHP 7)
xml_set_default_handler — Set up default handler
xml_set_default_handler ( XMLParser $parser , callable $handler ) : bool
 Sets the default handler function for the XML parser parser. 
parser
A reference to the XML parser to set up default handler function.
handler
 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 ( XMLParser $parser , string $data )
parser data 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. 
Note: Instead of a function name, an array containing an object reference and a method name can also be supplied.
| Version | Description | 
|---|---|
| 8.0.0 |  parser expects an XMLParser instance now; previously, a resource was expected.  |  
 Returns true on success or false on failure. 
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    https://www.php.net/manual/en/function.xml-set-default-handler.php