xml_set_external_entity_ref_handler

Parameters

parser

The XML parser.

handler

If null is passed, the handler is reset to its default state.

Warning

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().

Warning

This is deprecated as of PHP 8.4.0.

Warning

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:

function handler(
    XMLParser $parser,
    string $open_entity_names,
    string|false $base,
    string $system_id,
    string|false $public_id
): bool

parser

The XML parser calling the handler.

open_entity_names

A space-separated list of the names of the entities that are open for the parse of this entity (including the name of the referenced entity).

base

This is the base for resolving the system identifier (system_id) of the external entity.

system_id

The system identifier as specified in the entity declaration.

public_id

The public identifier as specified in the entity declaration, or an empty string if none was specified; the whitespace in the public identifier will have been normalized as required by the XML spec.

The handler should return true if the entity was handled, false otherwise. When returning false the XML parser will stop parsing and xml_get_error_code() will return XML_ERROR_EXTERNAL_ENTITY_HANDLING.