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I am running RHEL 7 and I am trying to use PHP 8.1. PHP is installing and the extensions are installed (per-Yum) but not enabled per-PHP.

  • For example, if I run php -m | grep dom from the command line I will get no results returned.

  • If I run sudo yum install php81-php-dom then yum returns

    Package php81-php-xml-8.1.6-1.el7.remi.x86_64 already installed and latest version.

  • I can use locate to see that there is a .so file for dom at /opt/remi/php81/root/usr/lib64/php/modules/dom.so.

  • There is an ini file at /etc/opt/remi/php81/php.d/20-dom.ini.

  • I have tried creating a softlink between /etc/opt/remi/php81/php.d/20-dom.ini and /etc/php.d/ (because I think that is where the ini file needs to be) and PHP returns

    HP Warning:  PHP Startup: Unable to load dynamic library 'dom'
(tried: /usr/lib64/php/modules/dom (/usr/lib64/php/modules/dom: cannot open shared object file: No such file or directory),
        /usr/lib64/php/modules/dom.so (/usr/lib64/php/modules/dom.so: cannot open shared object file: No such file or directory))
in Unknown on line 0

I am not sure what I need to do to get this extension and others to be available for PHP. I also tried 8.0.

Any help is greatly appreciated.

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  • I believe that you also have other php versions installed and the php executable is linked with some other version than 8.1 What does php -v show? Can you also try php81 -m | grep dom Commented May 18, 2022 at 13:56
  • @ttsakpc I think you were right. I had deleted the last machine with this problem but I tried again with just sudo yum install -y --enablerepo=remi-php80 php rather than also including php-cli. I am then adding all the extensions with sudo yum install php80-php-{cli,bcmath,curl,date,dom,gd,json,mbstring,pdo,simplexml,xml,zip} -y. Thank you for your help! Commented May 21, 2022 at 7:03
  • Unfortunately, that was not the problem my test did not check the dom library that still appears not to be installed. Commented May 22, 2022 at 18:57

3 Answers 3

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You are confused by php80-php-* packages, designed for parallel installation of multiple versions (Software Collections) and php-* packages for default installation.

As explained in the FAQ

For a proper repository configuration, follow the Wizard instructions.

So if you need dom extension for base installation

yum install php-dom

if you need pgsql and mysqli extensions for SCL installation

yum install php80-php-pgsql php80-php-mysqli

P.S. also a kind reminder that EL-7 is now very old (8 years) and that newer distributions (EL-8 or EL-9) are better to run modern software, such as recent PHP versions.

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Having similar problem with install php-pgsql / php-mysql extension on CentOs 8.

php artisan migrate

PHP Warning: PHP Startup: Unable to load dynamic library 'php_pgsql.dll' (tried: /opt/remi/php80/root/usr/lib64/php/modules/php_pgsql.dll (/opt/remi/php80/root/usr/lib64/php/modules/php_pgsql.dll: cannot open shared object file: No such file or directory), /opt/remi/php80/root/usr/lib64/php/modules/php_pgsql.dll.so (/opt/remi/php80/root/usr/lib64/php/modules/php_pgsql.dll.so: cannot open shared object file: No such file or directory)) in Unknown on line 0

Solved this for php 8.0 with command

yum install php80-php-pgsql
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Thanks to Remi Collet for clearing up the confusion between installing PHP extensions for single PHP installations and multiple version PHP installations.

In this case, on AlmaLinux 8 (Centos 8 compatible) system, with a single PHP installation, logged in as root user.

First verify single PHP installalation:

> locate bin/php
/usr/bin/php
/usr/bin/php-cgi
/usr/bin/phpize
/usr/sbin/php-fpm

Indeed, a single PHP installation.

For additional troubleshooting, determine the location of the PHP extension modules and configuration files. Searching /etc/php.ini reveals:

;;;;
; Note: packaged extension modules are now loaded via the .ini files
; found in the directory /etc/php.d; these are loaded by default.
;;;;

Notice PHP is looking in /etc/php.d for an extension module configuration file. Attempt to list the extension module and it's configuration file:

> ls -la /usr/lib64/php/modules/ | grep dom.so
> ls -la /etc/php.d/ | grep dom.ini

Is there a config file in the /etc/php.d directory? If so, read it to see what directory PHP is looking for the extension in, and compare that to /usr/lib64/php/modules/dom.so.

If there is no config file for that extension in /etc/php.d that's why PHP is not loading the extension.

There are two options if you have a version specific extension loaded, 1) (not recommended) is to move the config file to the /etc/php.d directory and make sure it points to the module location, or, 2) (recommended) is to remove the previous extension installation and use the proper repository and package to install it.

To properly install a PHP extension module for single PHP installation...

...start by listing the system's current repo status (in pertinent part):

> dnf repolist all
repo id    repo name                                                  status
apprepo    apprepo                                                    enabled
appstream  AlmaLinux 8 - AppStream                                    enabled
baseos     AlmaLinux 8 - BaseOS                                       enabled
epel       Extra Packages for Enterprise Linux 8 - x86_64             enabled
extras     AlmaLinux 8 - Extras                                       enabled
powertools AlmaLinux 8 - PowerTools                                   enabled
remi       Remi's RPM repository for Enterprise Linux 8 - x86_64      disabled
remi-safe  Safe Remi's RPM repository for Enterprise Linux 8 - x86_64 enabled

Is PowerTools enabled? (AlmaLinux 8 comes with powertools installed.)

powertools AlmaLinux 8 - PowerTools                                   enabled

...yes. However, if not enabled:

> dnf config-manager --set-enabled powertools

Is epel repo installed and enabled? In this case yes, but if not:

> dnf install epel-release

Is remi repo installed and enabled? In this case yes, but if not:

> dnf install https://rpms.remirepo.net/enterprise/remi-release-8.rpm
> dnf config-manager --set-enabled remi

Now simply:

> dnf install php-dom
> systemctl restart nginx
> systemctl restart php-fpm

And verify:

> php -m | grep dom
dom
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