I've found an error on a page in my Magento application; it always show this message error when I visit it:

Fatal error: Class 'DOMDocument' not found in /home/.../lib/Zend/Feed/Abstract.php on line 95

Can you give me a solution? I'm using magento 1.4.1.1.

19 Answers

You need to install the DOM extension. You can do so on Debian / Ubuntu using:

sudo apt-get install php-dom 

And on Centos / Fedora / Red Hat:

yum install php-xml 

If you get conflicts between PHP packages, you could try to see if the specific PHP version package exists instead: e.g. php53-xml if your system runs PHP5.3.

PHP 7.0:

• Ubuntu: apt-get install php7.0-xml
• CentOS / Fedora / Red Hat: yum install php70w-xml

PHP 7.1:

• Ubuntu: apt-get install php7.1-xml
• CentOS / Fedora / Red Hat: yum install php71w-xml

PHP 7.2:

• Ubuntu: apt-get install php7.2-xml
• CentOS / Fedora / Red Hat: yum install php72w-xml

PHP 7.3:

• Ubuntu: apt-get install php7.3-xml
• CentOS / Fedora / Red Hat: yum install php73w-xml

PHP 7.4:

• Ubuntu: apt-get install php7.4-xml
• CentOS / Fedora / Red Hat: yum install php74w-xml

PHP 8.0

• Ubuntu: apt-get install php8.0-xml
• CentOS 8 [with php:remi-8.0 enabled]: dnf install php-xml

PHP8: (latest version)

sudo apt-get install php8.0-xml 

PHP7:

sudo apt-get install php7.1-xml 

You can also do:

sudo apt-get install php-dom 

and apt-get will show you where it is.

Package php-dom is a virtual package provided by: php7.1-xml 7.1.3+-3+deb.sury.org~xenial+1 php7.0-xml 7.0.17-3+deb.sury.org~xenial+1 php5.6-xml 5.6.30-9+deb.sury.org~xenial+1 You should explicitly select one to install. 

In case anyone using 5.6 versions then go with this way

sudo apt-get install php5.6-xml 

For PHP ver PHP7, Ubuntu:

sudo apt-get install php7.1-xml 

or by

yum install php-xml 

I'm using Centos and the followings worked for me , I run this command

yum --enablerepo remi install php-xml 

And restarted the Apache with this command

sudo service httpd restart 

Create an empty PHP file and put only <?php phpinfo(); in it, look at it in a browser.
Check if you can spot --disable-dom in the configuration options and/or if you can see details about the DOM extension in the list below.

If you cannot see DOM in the list or you see it is disabled, your PHP installation does not include the DOM extension. You'll need to recompile your PHP installation from source to remedy that.

After a long time suffering from it in PHPunit...

For those using namespace, which is very common with Frameworks or CMS, a good check in addition to seeing if php-xml is installed and active, is to remember to declare the DOMDocument after the namespace:

namespace YourNameSpace\YourNameSpace; use DOMDocument; //<--- here, check this! 

In my case the problem was it was the use of namespace at the top of php file, exemple :

namespace MediaWiki\Extensions\ParserFunctions;

To solve this problem add the following line:

use DOMDocument;

So no need of installing dom or xml if they are already installed. It is a php language trap.

This help for me (Ubuntu Linux) PHP 5.6.3

sudo apt-get install php5.6-dom

Thats work for me.

For PHP 7.4 Install the DOM extension.

Debian / Ubuntu:

sudo apt-get update sudo apt-get install php7.4-xml sudo service apache2 restart 

Centos / Fedora / Red Hat:

yum update yum install php74w-xml systemctl restart httpd 

For previous PHP releases, replace with your version.

Using Suse Linux (Linux linux 3.16.7-48-default) and PHP 5.6.1 as root, this helped:

zypper in php5-dom 

plus restart

systemctl restart apache2 

On fedora 26:

dnf install php-dom 

Fixes it !

For Centos 7 and php 7.1:
yum install php71w-xml
apachectl restart

If compiling from source with --disable-all then DOMDocument support can be enabled with
--enable-dom

Example:

./configure --disable-all --enable-dom 

Tested and working for Centos7 and PHP7

I'm using CentOS 7 with virtualmin and three PHP versions. I also have REMI repo enabled. it worked for me:

Step 1:

Just append PHP major version number like this php{version number}-xml. And run yum install

yum install php70-php-xml yum install php71-php-xml yum install php72-php-xml 

Step 2:

Don't forget to restart Apache:

service httpd restart 

On a Amazon Linux 2 with PHP 8.0, I had to

yum-config-manager --enable remi-php80 yum install php-xml 

Do not forget to restart PHP

systemctl restart php-fpm 

If you are using PHP7.0 to install Magento, I suggest to install all extensions by this command

sudo apt-get install php7.0 php7.0-xml php7.0-mcrypt php7.0-curl php7.0-cli php7.0-mysql php7.0-gd libapache2-mod-php7.0 php7.0-intl php7.0-soap php7.0-zip php7.0-bcmath

I need to Google some times to meet Magento requirement.

I think you can replace the PHP version to 7.x if you use another PHP version

And restart Apache is needed to load new extensions

sudo service apache2 restart

PHP 7.X Centos 7

I got dependency issues when trying to install module with above suggestions, adding this flag:

--enablerepo=remi-php7X

Resolved dependencies.

So

sudo yum --enablerepo=remi-php7X install php-xml

Then

service httpd restart

Ref: Install PHP Modules

this is the lastest for php v 8.0

sudo apt-get install php8.0-xml