PHP - Manual: libxml_disable_entity_loader

2024-11-23

libxml_get_errors »

« libxml_clear_errors

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

libxml_disable_entity_loader(bool $disable = true): bool

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

disable: Disable (true) or enable (false) libxml extensions (such as DOM, XMLWriter and XMLReader) to load external entities.

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_NOENT constant

add a note

User Contributed Notes 6 notes

down

vavra at 602 dot cz ¶

4 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.

down

suconghou at gmail dot com ¶

1 year 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);
}

down

phofstetter at sensational dot ch ¶

8 years ago


Be mindful that this also disables url loading in simplexml_load_file() and likely other libxml based functions that deal with URLs

down

simonsimcity ¶

10 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

down

-5

daschtour at me dot com ¶

8 years ago


This function was reported to be not thread safe. So this might affect php-scripts on the same server.

down

-2

brendan at bloodbone dot ws ¶

8 years ago


This also seems to have an impact on <xsl:import /> statements if this is applied when loading XSLT for the XSLTProcessor class.

add a note

官方地址：https://www.php.net/manual/en/function.libxml-disable-entity-loader.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 adodb手册 opcache预加载 Composer的Packagist资源 mysql面试题支持php7的性能采集扩展 PHP7 mcrypt替代方案 PHP注释规范 php上周一、本周一、下周一日期 php扩展开发 php 修改图片大小如何在Composer中为GitLab实例设置访问令牌

略微加速

PHP官方手册 - 互联网笔记

libxml_disable_entity_loader

说明

参数

返回值

参见

User Contributed Notes 6 notes