I am running the WordPress multisite click to deploy on the compute engine.
Operating system Debian 9.8 Package contents Apache 2.4.25 Google-Fluentd 1.6.9 MySQL-Client 5.7.26 MySQL-Server 5.7.26 PHP 7.0.33 Stackdriver-Agent 5.5.2 WP-CLI 2.2.0 WordPress 5.1.1 phpMyAdmin 4.6.6
I would like to upgrade PHP to 7.3
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Answer
You can use a third-party repository to install php7.3
apt-get install ca-certificates apt-transport-https wget -q https://packages.sury.org/php/apt.gpg -O- | sudo apt-key add - echo "deb https://packages.sury.org/php/ stretch main" | sudo tee /etc/apt/sources.list.d/php.list apt-get update apt-get install php7.3