Source: http://www.syahzul.com/2016/04/06/how-to-install-oci8-on-ubuntu-14-04-and-php-5-6/ Source: https://medium.com/@kabeza/setup-oracle-instant-client-with-apache-and-php-7-on-ubuntu-server-17-04-66cea2297d6f Source: https://gist.github.com/hewerthomn/81eea2935051eb2500941a9309bca703#file-install_oci8_ubuntu_16-04_php7-1-md

Add Ondrej Sury PPA for PHP 7.3

sudo add-apt-repository ppa:ondrej/php

apt update && apt upgrade

apt install php7.3-curl php7.3-gd php7.3-mysql php7.3-mbstring php7.3-cli php7.3-xml php7.3-zip

Download the Oracle Instant Client and SDK from Oracle website. (Need to login in Oracle page)

https://www.oracle.com/database/technologies/instant-client/linux-x86-64-downloads.html

Files: instantclient-basic-linux.x64-19.5.0.0.0dbru.zip and instantclient-sdk-linux.x64-19.5.0.0.0dbru.zip.

Create a new folder to store Oracle Instant Client zip files on your server.

Upload the Instant Clients files inside this folder.

sudo mkdir /opt/oracle

Now we need to extract the files.

cd /opt/oracle
unzip instantclient-basic-linux.x64-12.2.0.1.0.zip
unzip instantclient-sdk-linux.x64-12.2.0.1.0.zip

Add the folder to our ldconfig.

sudo -s
echo /opt/oracle/instantclient_19_5 > /etc/ld.so.conf.d/oracle-instantclient

Update the Dynamic Linker Run-Time Bindings

ldconfig

Done. Now we can proceed to the next part.

To install the OCI8 extension, we need to install some additional package on our server.

Run these command:

apt-get install php-dev php-pear build-essential libaio1

Once installed, we need to get the OCI8 file. But, before that we need to update PECL channel.

pecl channel-update pecl.php.net

Then.

pecl install oci8

When you are prompted for the Instant Client location, enter the following:

instantclient,/opt/oracle/instantclient_19_5

We need to tell PHP to load the OCI8 extension.

echo "extension = oci8.so" >> /etc/php/7.3/fpm/php.ini
echo "extension = oci8.so" >> /etc/php/7.3/cli/php.ini
echo "extension = oci8.so" >> /etc/php/7.3/apache2/php.ini

We also need to add on apache those environment variables.

echo "export LD_LIBRARY_PATH=/opt/oracle/instantclient_19_5" >> /etc/apache2/envvars
echo "export ORACLE_HOME=/opt/oracle/instantclient_19_5" >> /etc/apache2/envvars
echo "LD_LIBRARY_PATH=/opt/oracle/instantclient_19_5:$LD_LIBRARY_PATH" >> /etc/environment

Refresh the server. If you are accessing through SSH, then

exit

or

sudo shutdown -r now

Check if the extension is enabled.

php -m | grep 'oci8'

If returns oci8, its works!

Restart the PHP-FPM

systemctl restart php7.3-fpm.service

Now you can connect to Oracle DBMS from your PHP applications.