(PHP 4, PHP 5, PHP 7, PHP 8)
xml_set_processing_instruction_handler — Set up processing instruction (PI) handler
Sets the processing instruction (PI) handler function for the XML parser
parser.
A processing instruction has the following format:
<?target data ?>
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.
parserThe XML parser.
handler
If null is passed, the handler is reset to its default state.
An empty string will also reset the handler, however this is deprecated as of PHP 8.4.0.
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().
This is deprecated as of PHP 8.4.0.
As of PHP 8.4.0, the callable is checked to be valid while setting the handler, not when it is called. This means that xml_set_object() must be called prior to setting a method string as the callback. However, as this behaviour is also deprecated as of PHP 8.4.0, using a proper callable for the method is recommended instead.
The signature of the handler must be:
parsertargetdata
Always returns true.
| Version | Description |
|---|---|
| 8.4.0 |
Passing a non-callable string to
handler is now deprecated,
use a proper callable for methods, or null to reset the handler.
|
| 8.4.0 |
The validity of handler as a callable
is now checked when setting the handler instead of checking when calling it.
|
| 8.0.0 |
parser expects an XMLParser
instance now; previously, a valid xml resource was expected.
|