How to Upgrade PHP on WordPress Step by Step
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How to Upgrade PHP on WordPress Step by Step
Upgrade PHP on WordPress is a common task when you run a WordPress server. Some essential plugins (for example RankMath SEO) may not run with the current Debian PHP version.
In this step-by-step tutorial, we will upgrade PHP 7.3 to PHP 7.4 on a Debian Buster WordPress server running Apache and PHP as an Apache module (the most common configuration).
Run the following commands as root or using sudo.
Current state:
php -vPHP 7.3.31-1~deb10u2 (cli) (built: Dec 15 2022 09:39:10) ( NTS )Copyright (c) 1997-2018 The PHP GroupZend Engine v3.3.31, Copyright (c) 1998-2018 Zend Technologieswith Zend OPcache v7.3.31-1~deb10u2, Copyright (c) 1999-2018, by Zend Technologies |
update-alternatives --config phpThere is only one alternative in link group php (providing /usr/bin/php): /usr/bin/php7.3Nothing to configure. |
STEP1 – Backup your site
Back up your database with mysqldump and the document root with tar. Put these files in a safe place (usually using scp).
As an alternative, you may use WP Migrate Lite to export your database.
STEP2 – Add the SURY repository
SURY repository offers many PHP versions.
You can add it to your system using the official guidelines for Debian:
apt-get updateapt-get -y install apt-transport-https lsb-release ca-certificates curlcurl -sSLo /usr/share/keyrings/deb.sury.org-php.gpg https://packages.sury.org/php/apt.gpgsh -c 'echo "deb [signed-by=/usr/share/keyrings/deb.sury.org-php.gpg] https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list'apt-get update |
Remark: on Ubuntu, you may use
add-apt-repository -y ppa:ondrej/php |
STEP3 – Setup PHP 7.4
apt-get install php7.4 |
Reading package lists... DoneBuilding dependency tree Reading state information... DoneThe following additional packages will be installed:libapache2-mod-php7.4 libpcre2-8-0 php7.4-cli php7.4-common php7.4-json php7.4-opcache php7.4-readlineSuggested packages:php-pearThe following NEW packages will be installed:libapache2-mod-php7.4 php7.4 php7.4-cli php7.4-common php7.4-json php7.4-opcache php7.4-readlineThe following packages will be upgraded:libpcre2-8-01 upgraded, 7 newly installed, 0 to remove and 37 not upgraded.Need to get 3,991 kB of archives.After this operation, 17.6 MB of additional disk space will be used.Do you want to continue? [Y/n] |
Current state:
php -vPHP 7.4.33 (cli) (built: Jan 13 2023 10:38:05) ( NTS )Copyright (c) The PHP GroupZend Engine v3.4.0, Copyright (c) Zend Technologieswith Zend OPcache v7.4.33, Copyright (c), by Zend Technologies |
update-alternatives --config phpThere are 2 choices for the alternative php (providing /usr/bin/php).Selection Path Priority Status------------------------------------------------------------* 0 /usr/bin/php7.4 74 auto mode1 /usr/bin/php7.3 73 manual mode2 /usr/bin/php7.4 74 manual modePress <enter> to keep the current choice[*], or type selection number: |
STEP4 – Setup PHP 7.4 extensions
These may vary depending on your WordPress configuration. However, the most common PHP extensions on a WordPress server are:
apt-get install php7.4-mysqlapt-get install php7.4-mbstringapt-get install php7.4-memcachedapt-get install php7.4-gdapt-get install php7.4-curlapt-get install php7.4-zipapt-get install php7.4-xmlapt-get install php7.4-imagickapt-get install php7.4-bcmathapt-get install php7.4-opcacheapt-get install php7.4-apcu |
Find a list of Extensions suggested by WordPress here.
STEP5 – Add custom configuration (if any)
In my case:
cp /etc/php/7.3/apache2/conf.d/99_error_log.ini /etc/php/7.4/apache2/conf.d/99_error_log.ini cp /etc/php/7.3/apache2/conf.d/99_security.ini /etc/php/7.4/apache2/conf.d/99_security.ini |
STEP6 – Apply the new PHP 7.4 version to Apache
a2dismod php7.3a2enmod php7.4systemctl restart apache2.service |
At this time, the changes are visible in phpinfo:
STEP7 – Switch PHP version
In case you need to change the configuration:
UPGRADE PHP 7.3 to PHP 7.4
systemctl stop apache2.servicea2dismod php7.3a2enmod php7.4update-alternatives --config phpupdate-alternatives --config pharupdate-alternatives --config phar.pharsystemctl start apache2.service |
DOWNGRADE PHP 7.4 to PHP 7.3
systemctl stop apache2.servicea2dismod php7.4a2enmod php7.3update-alternatives --config phpupdate-alternatives --config pharupdate-alternatives --config phar.pharsystemctl start apache2.service |
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