Upgrading PHP version on Linux for Apache

  1. Install the Apache module for specific php version

    sudo apt install libapache2-mod-php7.3

  1. Copy the php.ini from previous version to newer version after making a backup of the original php.ini for new version.

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    sudo cp /etc/php/7.3/apache2/php.ini php.ini.original
sudo cp /etc/php/7.2/apache2/php.ini /etc/php/7.3/apache2/php.ini

  2. Install specific php modules for Apache and enable the php modules on new version of php.

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    sudo apt install php7.3-curl php7.3-gd php7.3-gmp php7.3-intl php7.3-mbstring php7.3-simplexml php7.3-soap php7.3-wddx php7.3-xmlreader php7.3-xmlrpc php7.3-xmlwriter php7.3-xsl php7.3-zip php7.3-xml php7.3-mysql
sudo phpenmod -v 7.3 pdo_mysql soap wddx xmlreader xmlrpc xsl zip intl gd dom curl mysqlnd gmp simplexml mysqli mbstring

  3. Disable old php version, enable new version and restart Apache server.

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    sudo a2dismod php7.2
sudo a2enmod php7.3
sudo systemctl restart apache2