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How to downgrade PHP-FPM (Downgrade php-fpm)

by Thạch Phạm

How to downgrade PHP-FPM on the CentOS server

I. Overview

During the installation and use process, you installed the PHP-FPM version too high, which is unsuitable for the services and applications on the server for some reasons such as services, applications just running In low PHP, service applications not being updated to be compatible with the new PHP. So when you encounter this situation and you are forced to downgrade the PHP version for compatibility.

Back to the article, I just installed PHP 8.0.1, this is the latest PHP version that was just released on 11/26/2020 and you can see the changes of PHP at this link. Because the PHP version is too high, the Themes and Plugins on my WordPress website cannot work and cause errors. Therefore, I have to downgrade PHP-FPM. And on how to downgrade, please follow along.

II. Implementation Guide

To downgrade PHP-FPM, you follow 4 these steps.

Step 1: Check the current PHP version

To check the current PHP-FPM version, use the php-fpm -v command:

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php-fpm -v

And my version is PHP 8.0.1, I will downgrade it to PHP 7.3

downgrade PHP-FPM

Step 2: Backup the configuration file

Because when you downgrade, the system will rewrite the configuration file to the original default. Therefore, you need to back up the old configuration file to restore it when the downgrade is complete.

I will clone into a new copy with the accompanying name .bak as follows: I will backup the configuration file php.ini and www.conf

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cp /etc/php.ini /etc/php.ini.bak
cp /etc/php-fpm.d/www.conf /etc/php-fpm.d/www.conf.bak

Step 3: Uninstall the PHP package

Next, you need to remove the PHP packages that appear to install on the new PHP package. And to check php packages, you can use the rpm -qa command:

  • See also: Instructions for using RPM on Linux
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rpm -qa | grep php
downgrade PHP-FPM

And then remove all installed PHP 8.0 packages and dependencies with the following command with the yum remove command.

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yum remove php-*
downgrade PHP-FPM

Step 4: Install the new PHP package

Now perform the PHP-FPM downgrade with the following command: Disable the old repo and enable the new repo. Since I need to downgrade PHP8 to PHP73, I will do disablerepo=remi-php80 and enablerepo=remi-php73

Note: Please change the current PHP version and the version you need to downgrade for the system to work correctly.

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yum --disablerepo=remi-php80 --enablerepo=remi-php73 install php php-common php-gd php-xml php-fpm php-mysqlnd php-json php-mbstring php-xmlrpc php-opcache php-mysql

Downgrading time is quite fast. It only takes a few minutes to complete and after the downgrade is successful, you can restore the previously backed-up configuration files.

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rm -rf /etc/php.ini
mv /etc/php.ini.bak /etc/php.ini

rm -rf /etc/php-fpm.d/www.conf
mv /etc/php-fpm.d/www.conf.bak /etc/php-fpm.d/www.conf

Start and check the PHP-FPM status

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systemctl start php-fpm
systemctl enable php-fpm
systemctl restart php-fpm
systemctl status php-fpm

And now use the php -v command again to check the PHP version. As shown below, I have done the complete downgrade.

See more:

III. Summary

So with the above steps, you have downgraded PHP-FPM completely and effectively. Wishing you success! See more useful articles about Linux VPS at the following link:

If you need assistance, you can contact support in the ways below:

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