libxml_disable_entity_loader

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

libxml_disable_entity_loaderDeshabilita la capacidad de cargar entidades externas

Descripción

libxml_disable_entity_loader(bool $disable = true): bool

Habilita/deshabilita la capacidad de cargar entidades externas.

Parámetros

disable

Deshabilita (true) o habilita (false) extensiones libxml (tal como DOM, XMLWriter y XMLReader) para cargar entidades externas.

Valores devueltos

Devuelve el valor anterior.

Ver también

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User Contributed Notes 6 notes

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9
vavra at 602 dot cz
6 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.
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3
suconghou at gmail dot com
3 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);
}
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3
simonsimcity
12 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
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2
phofstetter at sensational dot ch
10 years ago
Be mindful that this also disables url loading in simplexml_load_file() and likely other libxml based functions that deal with URLs
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-2
brendan at bloodbone dot ws
9 years ago
This also seems to have an impact on <xsl:import /> statements if this is applied when loading XSLT for the XSLTProcessor class.
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-6
daschtour at me dot com
10 years ago
This function was reported to be not thread safe. So this might affect php-scripts on the same server.
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