Mid-Atlantic Developer Conference


(PHP 5 >= 5.2.11, PHP 7)

libxml_disable_entity_loader Отключение возможности загрузки сущностей из внешних источников


bool libxml_disable_entity_loader ([ bool $disable = TRUE ] )

Отключение/включение возможности загружать внешние сущности.

Список параметров


Отключение (TRUE) или включение (FALSE) расширений libxml (таких как DOM, XMLWriter и XMLReader) для загрузки внешних сущностей.

Возвращаемые значения

Возвращает предыдущее значение.

Смотрите также

add a note add a note

User Contributed Notes 5 notes

6 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">]>

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
phofstetter at sensational dot ch
4 years ago
Be mindful that this also disables url loading in simplexml_load_file() and likely other libxml based functions that deal with URLs
vavra at 602 dot cz
3 months ago
If is called

, 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.
daschtour at me dot com
4 years ago
This function was reported to be not thread safe. So this might affect php-scripts on the same server.
brendan at bloodbone dot ws
4 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