PHP 8.5.0 Alpha 1 available for testing

libxml_disable_entity_loader

(PHP 5 >= 5.2.11, PHP 7, PHP 8)

libxml_disable_entity_loaderDesactiva la carga de entidades externas

Advertencia

Esta función ha sido declarada OBSOLETA a partir de PHP 8.0.0. Su uso está totalmente desaconsejado.

Descripción

#[\Deprecated]
libxml_disable_entity_loader(bool $disable = true): bool

Activa o desactiva la carga de entidades externas. Se debe tener en cuenta que desactivar la carga de entidades externas puede causar problemas al cargar documentos XML.

A partir de libxml 2.9.0, la sustitución de entidades está desactivada por defecto, por lo que no es necesario desactivar la carga de entidades externas, a menos que sea necesario resolver referencias de entidades internas con LIBXML_NOENT, LIBXML_DTDVALID, o LIBXML_DTDLOAD. Generalmente, es preferible utilizar libxml_set_external_entity_loader() para suprimir la carga de entidades externas. La constante LIBXML_NO_XXE también puede ser utilizada para evitar esto (disponible únicamente en Libxml >= 2.13.0, a partir de PHP 8.4.0).

Parámetros

disable

Desactiva (true) o activa (false) la carga de entidades externas por las extensiones libxml (tales como DOM, XMLWriter y XMLReader).

Valores devueltos

Devuelve la configuración anterior.

Historial de cambios

Versión Descripción
8.0.0 Esta función ha sido deprecada.

Ver también

add a note

User Contributed Notes 6 notes

up
8
suconghou at gmail dot com
4 years ago
In PHP 8.0 and later, PHP uses libxml versions from 2.9.0, libxml_disable_entity_loader is deprecated.
so it is now safe to remove all `libxml_disable_entity_loader` calls on php8

if you want Backwards Compatibility

use this snippet

if (\PHP_VERSION_ID < 80000) {
libxml_disable_entity_loader(true);
}
up
8
vavra at 602 dot cz
7 years ago
If is called
libxml_disable_entity_loader(true);

, it causes that new SoapClient(.) fails with

SOAP-ERROR: Parsing WSDL: Couldn't load from 'D:\path/dm_operations.wsdl' : failed to load external entity "D:\path/dm_operations.wsdl

because this wsdl imports a xsd as an another external file.
Tested on php 7.1.12, win x64.
up
0
editor at geekkb.com
2 years ago
There is an extra \ should be deleted before PHP_VERSION_ID in the code which suconghou posted 2 years ago.

if (PHP_VERSION_ID < 80000) {
libxml_disable_entity_loader(true);
}
up
0
phofstetter at sensational dot ch
11 years ago
Be mindful that this also disables url loading in simplexml_load_file() and likely other libxml based functions that deal with URLs
up
0
simonsimcity
13 years ago
Using this function you can prevent a vulnerable to Local and Remote File Inclusion attacks.

You'll see it in an example where I load and validate the following string:

<!DOCTYPE scan [<!ENTITY test SYSTEM "php://filter/read=convert.base64-encode/resource=/etc/passwd">]>
<scan>&test;</scan>

One way to prevent that the file in given back is to set this value to 0.
Please take a closer look at the release of symfony 2.0.11
up
-3
brendan at bloodbone dot ws
11 years ago
This also seems to have an impact on <xsl:import /> statements if this is applied when loading XSLT for the XSLTProcessor class.
To Top