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  • First prerequirements are a working apache2 and php7.2 (Ubunti 18.04) environment.
  • Download the basic (like instantclient-basic-linux.x64-12.2.0.1.0.zip) and the sdk (instantclient-sdk-linux.x64-12.2.0.1.0.zip) package from the Oracle Website http://www.oracle.com/technetwork/database/database-technologies/instant-client/downloads/index.html
  • Upload both files to your webserver, you can use WinSCP (windows) or rsync/scp (linux) for it
  • Unzip both files on server, in my case, you will get a new folder named "instantclient_12_2"
  • Create destination folder : mkdir /opt/oracle
  • Move and rename the instantclient folder: mv instantclient_12_2 /opt/oracle/instantclient
  • Change rights on folder: chown -R root:www-data /opt/oracle 
  • Check if you have the required packages for installing OCI8: apt install php7.2-dev php-pear build-essential libaio1 
  • Create necessary soft links: ln -s /opt/oracle/instantclient/libclntsh.so.12.1 /opt/oracle/instantclient/libclntsh.so; ln -s /opt/oracle/instantclient/libocci.so.12.1 /opt/oracle/instantclient/libocci.so
  • Add instant client to ld config files : echo /opt/oracle/instantclient > /etc/ld.so.conf.d/oracle-instantclient.conf
  • Update Dynamic Linker Run-Time Bindings : ldconfig
  • Now install OCI8 by pecl: pecl install oci8
  • The OCI8 installation is asking you for the right folder: instantclient,/opt/oracle/instantclient
  • Add oci lib to the cli php config (console php): echo "extension = oci8.so" >>/etc/php/7.2/cli/php.ini
  • Add oci lib to the apache php config: echo "extension = oci8.so" >> /etc/php/7.2/apache2/php.ini
  • Set environment variables for the cli version (you will need to reboot the server after): echo "LD_LIBRARY_PATH=\"/opt/oracle/instantclient\"" >> /etc/environment echo "ORACLE_HOME=\"/opt/oracle/instantclient\"" >> /etc/environment
  • Set environement variables for the apache version: echo "export LD_LIBRARY_PATH=\"/opt/oracle/instantclient\"" >> /etc/apache2/envvars; echo "export ORACLE_HOME=\"/opt/oracle/instantclient\"" >> /etc/apache2/envvars 
  • Restart Apache: service apache2 restart or systemctl restart apache2 
  • You're done, now you can test your connection to the Oracle database

Source: https://serverfault.com/questions/911475/howto-install-oracle-oci8-instantclient-on-ubuntu-18-04

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