php man page for xml_set_processing_instruction_handler

XML_SET_PROCESSING_INSTRUCTION_HANDLER(3)				 1				 XML_SET_PROCESSING_INSTRUCTION_HANDLER(3)

xml_set_processing_instruction_handler - Set up processing instruction (PI) handler

SYNOPSIS
       bool xml_set_processing_instruction_handler (resource  $parser, callable  $handler)

DESCRIPTION
	Sets the processing instruction (PI) handler function for the XML parser $parser.

	A processing instruction has the following format:

       target data?>
       ?>)  can  not  be  quoted, so this character sequence should not appear in the PHP code you embed with PIs in XML documents.If it does, the
       rest of the PHP code, as well as the "real" PI end tag, will be treated as character data.

PARAMETERS
	      o $parser
		- A reference to the XML parser to set up processing instruction (PI) handler function.

	      o $handler
		-$handler is a string containing the name of a function that must exist when xml_parse(3) is called  for  $parser.   The  function
		named by $handler must accept three parameters:
		 handler (resource  $parser, string  $target, string  $data)

		     o $parser
		       - The first parameter, parser, is a reference to the XML parser calling the handler.

		     o $target
		       - The second parameter, $target, contains the PI target.

		     o $data
		       - The third parameter, $data, contains the PI data.

	       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.

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

PHP Documentation Group 										 XML_SET_PROCESSING_INSTRUCTION_HANDLER(3)