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);
}
libxml_disable_entity_loader
(PHP 5 >= 5.2.11, PHP 7, PHP 8)
libxml_disable_entity_loader — Disable the ability to load external entities
警告
本函数已自 PHP 8.0.0 起被废弃。强烈建议不要依赖本函数。
说明
Disable/enable the ability to load external entities.
Note that disabling the loading of external entities may cause general issues
with loading XML documents. However, as of libxml 2.9.0 entity substitution
is disabled by default, so there is no need to disable the loading of external
entities,
unless there is the need to resolve internal entity references with LIBXML_NOENT.
Generally, it is preferable to use libxml_set_external_entity_loader()
to suppress loading of external entities.
参数
返回值
Returns the previous value.
参见
- libxml_use_internal_errors() - Disable libxml errors and allow user to fetch error information as needed
- libxml_set_external_entity_loader() - Changes the default external entity loader
- The
LIBXML_NOENTconstant
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User Contributed Notes 7 notes
suconghou at gmail dot com ¶
3 years ago
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.
editor at geekkb.com ¶
1 year 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);
}
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
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
brendan at bloodbone dot ws ¶
10 years ago
This also seems to have an impact on <xsl:import /> statements if this is applied when loading XSLT for the XSLTProcessor class.
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.
