If you need to do this from scratch I have followed these how-to-install-and-configure-php-70-or-php-71-on-ubuntu-16-04 insructions to install PHP7.0 and apache.
Once installed then
Follow these instructions to compile oci8 extentions Oracle tech note OCI8
Download the instant client from oracle’s web site here : Oracle instant client download
I downloaded the .ZIP files since I dont have RPM installed.
I then extracted it to ~/Downloads/instantclient_12_2
NOTE: Download the instantclient-basic-linux.x64-12.2.0.1.0.zip and instantclient-sdk-linux.x64-12.2.0.1.0.zip
cd ~Downloads
unzip instantclient-basic-linux.x64-12.2.0.1.0.zip
unzip instantclient-sdk-linux.x64-12.2.0.1.0.zip
Now we need to create the paths
sudo mkdir /usr/lib/oracle
sudo mkdir /usr/lib/oracle/12.2
sudo mkdir /usr/lib/oracle/12.2/client64
sudo mkdir /usr/lib/oracle/12.2/client64/lib
cd ~/Downloads/instantclient_12_2
sudo cp * /usr/lib/oracle/12.2/client64/lib/
cd /usr/lib/oracle/12.2/client64/lib/
ln -s libclntsh.so.12.1 libclntsh.so
sudo mkdir /usr/include/oracle
sudo mkdir /usr/include/oracle/12.2
sudo mkdir /usr/include/oracle/12.2/client64
cd ~/Downloads/instantclient_12_2/sdk/include
sudo cp * /usr/include/oracle/12.2/client64
export ORACLE_HOME=/usr/lib/oracle/12.2
Edit ld.so.conf and include oracle libs. Add a file called oracle.conf under /etc/ld.so.conf.d
cd /etc/ld.so.conf.d
sudo vi oracle.conf
PRESS ESC i
/usr/lib/oracle/12.2/client64/lib
PRESS ESC :wq
Now to download and compile OCI8
sudo pecl install oci8 --with-oci8=instantclient,/usr/lib/oracle/12.2/client64/lib
On My machine it compiled it under ‘/usr/lib/php/20151012/oci8.so’ but look at the last few lines it should echo it.
First lets install a page to test that the configuration works.
sudo vi /var/www/html/t.php ( or xed /var/www/html/t.php if you dont know vi)
Press ESC i and paste
Press ESC :qw
now open your favorite browser and go to http://localhost/t.php and you should see a information page of php
to configure php do:
cd /etc/php/7.0/mods-available
vi oci8.ini
Edit oci8.ini with content
extension=oci8.so
Now restart
sudo service apache2 restart
My Installation now gave an error
apachectl configtest
if you get an error about libaio.so.1: cannot open shared object file: No such file or directory
sudo apt-get install libaio1 libaio-dev
Now we need to give the path to the libraries.
Edit /etc/apache2/envvars and add the flowing to the bottom of the file
ORACLE_HOME=/usr/lib/oracle/12.2/client64
LD_LIBRARY_PATH=/usr/lib/oracle/12.2/client64/lib
LD_LIBRARY_PATH64=/usr/lib/oracle/12.2/client64/lib/
#TNS_ADMIN=$ORACLE_HOME/network/admin
#NLS_LANG=AMERICAN_AMERICA.WE8MSWIN1252
#ORACLE_SID=your_db
To Test
php --ri oci8