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XML
PHP Manual

xml_set_processing_instruction_handler

(PHP 4, PHP 5)

xml_set_processing_instruction_handler — Set up processing instruction (PI) handler

說明

bool xml_set_processing_instruction_handler ( resource $parser , callback $handler )

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

A processing instruction has the following format: 

<?
target data
?>
You can put PHP code into such a tag, but be aware of one limitation: in an XML PI, the PI end tag (?>) 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.

參數

parser

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 three parameters:

handler ( resource $parser , string $target , string $data )
parser
The first parameter, parser, is a reference to the XML parser calling the handler.
target
The second parameter, target , contains the PI target.
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: 除了函式名稱，還可以用一個包含物件參照和方法名稱的陣列作參數。

Return值

如果成功則回傳 TRUE，失敗則回傳 FALSE。

XML
PHP Manual