xml_set_processing_instruction_handler

    (PHP 4, PHP 5, PHP 7, PHP 8)

    xml_set_processing_instruction_handler — Set up processing instruction (PI) handler

    Description

    xml_set_processing_instruction_handler(XMLParser $parser, callable $handler): true

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

    A processing instruction has the following format: 

    <?target
data
?>

    Caution

    PHP code is delimited by the <?php processing instruction. As such it is possible to have PHP code within an XML document. However, the PI end tag (?>) must not be part of the data. If a PI end tag exists as part of the embedded PHP code, the rest of the PHP code and the "real" PI end tag, will be treated as character data.

    Parameters

    parser

    The XML parser.

    handler

    If null or an empty string is passed, the handler is reset to its default state.

    If handler is a callable, the callable is set as the handler.

    If handler is a string, it can be the name of a method of an object set with xml_set_object().

    The signature of the handler must be:

    handler(XMLParser $parser, string $target, string $data): void
    parser
    The XML parser calling the handler.
    target
    The processing instruction target.
    data
    The processing instruction data.

    Return Values

    Always returns true.

    Changelog

    Version Description
    8.0.0 parser expects an XMLParser instance now; previously, a valid xml resource was expected.

    Improve This Page

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes

    There are no user contributed notes for this page.
    To Top